# Power of 10

Visualisation of powers of 10 from one to 1 billion.

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, 1000, 10000, 100000, 1000000, 10000000. ... (sequence A011557 in 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.

Name Power Number SI symbol SI prefix
One 0 1 (none) (none)
Ten 1 10 da(D) deca
Hundred 2 100 h(H) hecto
Thousand 3 1,000 k(K) kilo
Hundred Thousand 5 100,000
Million 6 1,000,000 M mega
Billion (Milliard) 9 1,000,000,000 G giga
Trillion (Billion) 12 1,000,000,000,000 T tera
Quadrillion (Billiard) 15 1,000,000,000,000,000 P peta
Quintillion (Trillion) 18 1,000,000,000,000,000,000 E exa
Sextillion (Trilliard) 21 1,000,000,000,000,000,000,000 Z zetta
Septillion (Quadrillion) 24 1,000,000,000,000,000,000,000,000 Y yotta
Nonillion (Quintillion) 30 1,000,000,000,000,000,000,000,000,000,000
Decillion (Quintilliard) 33 1,000,000,000,000,000,000,000,000,000,000,000
Undecillion (Sextillion) 36 1,000,000,000,000,000,000,000,000,000,000,000,000
Duodecillion (Sextilliard) 39 1,000,000,000,000,000,000,000,000,000,000,000,000,000
Tredecillion (Septillion) 42 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Quattuordecillion (Septilliard) 45 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
Quindecillion (Octillion) 48 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
... ... ... ... ...
Googol 100 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,
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:

Name Power Number SI symbol SI prefix
One 0 1 (none) (none)
Tenth −1 0.1 d deci
Hundredth −2 0.01 c centi
Thousandth −3 0.001 m milli
Ten Thousandth (Myriadth) −4 0.000 1
Hundred Thousandth −5 0.000 01
Millionth −6 0.000 001 μ micro
Billionth −9 0.000 000 001 n nano
Trillionth −12 0.000 000 000 001 p pico
Quadrillionth −15 0.000 000 000 000 001 f femto
Quintillionth −18 0.000 000 000 000 000 001 a atto
Sextillionth −21 0.000 000 000 000 000 000 001 z zepto
Septillionth −24 0.000 000 000 000 000 000 000 001 y yocto
Octillionth −27 0.000 000 000 000 000 000 000 000 001
Nonillionth −30 0.000 000 000 000 000 000 000 000 000 001
Decillionth −33 0.000 000 000 000 000 000 000 000 000 000 001
Undecillionth −36 0.000 000 000 000 000 000 000 000 000 000 000 001
Duodecillionth −39 0.000 000 000 000 000 000 000 000 000 000 000 000 001
Tredecillionth −42 0.000 000 000 000 000 000 000 000 000 000 000 000 000 001
Quattuordecillionth −45 0.000 000 000 000 000 000 000 000 000 000 000 000 000 000 001
Quindecillionth −48 0.000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 001
... ... ... ... ...

## Googol

The number googol is 10100. The term was coined by 9-year-old Milton Sirotta, nephew of American mathematician Edward Kasner, popularized in his 1940 book Mathematics and the Imagination, 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.

The name of this power of ten inspired the name of the company Google.

## 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.