Create Free Account | Log In


A Uncentillion (1 Uncentillion) is 10 to the power of 306 (10^306). This is an exorbitantly astronomical number!

How many zeros in a Uncentillion?

There are 306 zeros in a Uncentillion.

What's before Uncentillion?

A Centillion is smaller than a Uncentillion.

What's after Uncentillion?

A Duocentillion is larger than a Uncentillion.


A Uncentillionaire is someone whos assets, net worth or wealth is 1 or more Uncentillion. It is unlikely anyone will ever be a true Uncentillionaire. If you want to be a Uncentillionaire, play Tap Tales!

Is Uncentillion the largest number?

Uncentillion is not the largest number. Infinity best describes the largest possible number - if there even is one! We cannot comprehend what the largest number actually is.

Uncentillion written out

Uncentillion is written out as:


Big Numbers

This is just one of many really big numbers!

Play Now

Choose your device:

FREE to download and play!