# Power of 10

In mathematics, a power of 10 is any of the integer powers of the number ten; in other words, ten multiplied by itself a certain number of times (when the power is a positive integer). By definition, the number one is a power (the zeroth power) of ten. The first few non-negative powers of ten are:

1, 10, 100, 1,000, 10,000, 100,000, 1,000,000, 10,000,000. ... (sequence A011557 in the OEIS)

## Positive powers

In decimal notation the nth power of ten is written as '1' followed by n zeroes. It can also be written as 10n or as 1En in E notation. See order of magnitude and orders of magnitude (numbers) for named powers of ten. There are two conventions for naming positive powers of ten, called the long and short scales. Where a power of ten has different names in the two conventions, the long scale name is shown in brackets.

The positive 10 power related to a short scale name can be determined based on its Latin name-prefix using the following formula: 10 [(prefix-number + 1) × 3]

Examples: Billion = 10 [(2 + 1) × 3] = 10 9 ; Octillion = 10 [(8 + 1) × 3] = 10 27

NamePowerNumberSI symbolSI prefix
One01(none)(none)
Ten110da(D)deca
Hundred2100h(H)hecto
Thousand31,000k(K)kilo
Hundred Thousand (Lakh)5100,000
Million61,000,000Mmega
Ten Million (Crore) 7 10,000,000
Hundred Million 8 100,000,000
Billion (Milliard)91,000,000,000Ggiga
Trillion (Billion)121,000,000,000,000Ttera
Quintillion (Trillion)181,000,000,000,000,000,000Eexa
Sextillion (Trilliard)211,000,000,000,000,000,000,000Zzetta
Nonillion (Quintillion)301,000,000,000,000,000,000,000,000,000,000
Decillion (Quintilliard)331,000,000,000,000,000,000,000,000,000,000,000
Undecillion (Sextillion)361,000,000,000,000,000,000,000,000,000,000,000,000
Duodecillion (Sextilliard)391,000,000,000,000,000,000,000,000,000,000,000,000,000
Tredecillion (Septillion)421,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Quattuordecillion (Septilliard)451,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Quindecillion (Octillion)481,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Sexdecillion (Octilliard)511,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Septendecillion (Nonillion)541,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Octodecillion (Nonilliard)571,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Novemdecillion (Decillion)601,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Vigintillion (Decilliard)631,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Googol10010,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,
000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

## Negative powers

The sequence of powers of ten can also be extended to negative powers.

Similarly to above, the negative 10 power related to a short scale name can be determined based on its Latin name-prefix using the following formula: 10 -[(prefix-number + 1) × 3]

Examples: billionth = 10 -[(2 + 1) × 3] = 10 -9 ; quintillionth = 10 -[(5 + 1) × 3] = 10 -18

NamePowerNumberSI symbolSI prefix
One01(none)(none)
Tenth10.1ddeci
Hundredth20.01ccenti
Thousandth30.001mmilli
Hundred-thousandth (Lacth)50.000 01
Millionth60.000 001μmicro
Billionth90.000 000 001nnano
Trillionth120.000 000 000 001ppico
Quintillionth180.000 000 000 000 000 001aatto
Sextillionth210.000 000 000 000 000 000 001zzepto
Septillionth240.000 000 000 000 000 000 000 001yyocto
Octillionth270.000 000 000 000 000 000 000 000 001
Nonillionth300.000 000 000 000 000 000 000 000 000 001
Decillionth330.000 000 000 000 000 000 000 000 000 000 001
Undecillionth360.000 000 000 000 000 000 000 000 000 000 000 001
Duodecillionth390.000 000 000 000 000 000 000 000 000 000 000 000 001
Tredecillionth420.000 000 000 000 000 000 000 000 000 000 000 000 000 001
Quattuordecillionth450.000 000 000 000 000 000 000 000 000 000 000 000 000 000 001
Quindecillionth480.000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 001
Sedecillionth510.000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 001
Septendecillionth540.000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 001

## Googol

The number googol is 10100. The term was coined by 9-year-old Milton Sirotta, nephew of American mathematician Edward Kasner. It was popularized in Kasner's 1940 book Mathematics and the Imagination, where it was used to compare and illustrate very large numbers. Googolplex, a much larger power of ten (10 to the googol power, or 1010100), was also introduced in that book.

## Scientific notation

Scientific notation is a way of writing numbers of very large and very small sizes compactly when precision is less important.

A number written in scientific notation has a significand (sometime called a mantissa) multiplied by a power of ten.

Sometimes written in the form:

m × 10n

Or more compactly as:

10n

This is generally used to denote powers of 10. Where n is positive, this indicates the number zeros after the number, and where the n is negative, this indicates the number of decimal places before the number.

As an example:

105 = 100,000[1]
10−5 = 0.00001[2]

The notation of mEn, known as E notation, is used in computer programming, spreadsheets and databases, but is not used in scientific papers.