10 to the 100th power is called a googol.

What that actually means

A googol is the number written as 1 followed by 100 zeros, i.e. 1010010^{100}10100. It is vastly larger than the number of atoms estimated in the observable universe, which is “only” around 108010^{80}1080.

Quick extra nugget

There is also a famous even bigger number called a googolplex , which is 10googol=101010010^{\text{googol}}=10^{10^{100}}10googol=1010100, meaning 1 followed by a googol zeros.

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