A Senonagintaducentillion (1 Senonagintaducentillion) is 10 to the power of 891 (10^891). This is an excessively astronomical number!

## How many zeros in a Senonagintaducentillion?

There are 891 zeros in a Senonagintaducentillion.

## What's before Senonagintaducentillion?

A Quinnonagintaducentillion is smaller than a Senonagintaducentillion.

## What's after Senonagintaducentillion?

A Septenonagintaducentillion is larger than a Senonagintaducentillion.

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

## Is Senonagintaducentillion the largest number?

Senonagintaducentillion 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.

## Senonagintaducentillion written out

Senonagintaducentillion is written out as:

1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

## Big Numbers

This is just one of many really big numbers!