How big is a googol? A googol, also called ten-duotrigintillion, is a very big number that is equal to 1 followed by 100 zeros as shown below.
10000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000
10000000000000000000000000000000000
000000000000000000000000000000000
000000000000000000000000000000000
In scientific notation, a googol can be written as 10^{100}
We can use commas to make the googol number a little easier to read.
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
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
1 googol = 10^{10} × 10^{10} × 10^{10} × 10^{10} × 10^{10} × 10^{10} × 10^{10} × 10^{10} × 10^{10} × 10^{10}
1 googol = ten billion × ten billion × ten billion × ten billion × ten billion × ten billion × ten billion × ten billion × ten billion × ten billion
1 googol = 10^{20} × 10^{20} × 10^{20} × 10^{20} × 10^{20}
Notice that 10^{20 }= 100,000,000,000,000,000,000 = 100 × 1,000,000,000,000,000,000 = 100 × 1 quintillion
Therefore, 1 googol = one hundred quintillion × one hundred quintillion × one hundred quintillion × one hundred quintillion × one hundred quintillion
The googol number was chosen or invented by the nephew of the American mathematician Edward Kasner. In the late 1930s, as Edward Kasner was working with large numbers, he asked his nine years old nephew Milton Sirotta what he might call the number 10^{100}. Milton Sirotta named it googol!
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