What’s the biggest number?

What is the name of the largest number in the world?

number googol
The number googol is a one with a hundred zeros. It got its name from a nine-year old boy. A googol is more than all the hairs in the world. It's more than all the grass blades and all the grains of sand.

How big is Rayo’s number?

Rayo's number: The smallest number bigger than any number that can be named by an expression in the language of first order set-theory with less than a googol (10100) symbols.

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