A googol is a famously huge number, literally ten to the one hundredth power. A math teacher might offer extra credit to students who correctly write out the digits of a googol on the blackboard.

If you want to write out a googol, write the number one followed by one hundred zeros. Mathematicians sometimes use the idea of a googol to illustrate the difference between an enormous number — one that's too large to imagine — and infinity. The word googol was invented by the young nephew of mathematician Edward Kasner, one of the authors of the 1940 book "Mathematics and the Imagination."

Definitions of googol

n a cardinal number represented as 1 followed by 100 zeros (ten raised to the power of a hundred)

Type of:
cardinal, cardinal number
the number of elements in a mathematical set; denotes a quantity but not the order

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