What is the factorial of 123? (123!) 123 Factorial

What is the factorial of 123?

Here we will show you how to calculate the factorial of 123 (aka 123 factorial) and give you the approximate scientific notation answer and the exact answer.

Before we begin, note that the factorial of 123 can be written as 123 followed by an exclamation mark like this: 123!

Factorial of 123 means that you multiply 123 by every number below it. Therefore, you calculate the factorial of 123 by multiplying 123 by 122, then by 121, and so on all the way down to 1. In other words, we calculate 123 × 122 × 121 × ... × 1 to get 123 factorial.

The answer to 123 factorial (123!) contains 206 digits and we have listed the exact entire answer at the bottom of this page. However, below is the approximate scientific notation answer to 123 factorial:

1.2146304367 × 10²⁰⁵

The answer above is also sometimes written as 1.2146304367e+205. Regardless, it means that the approximate answer to 123! is 12146304367 followed by 195 more digits.

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Like we promised, below is the exact answer to 123 factorial (123!) with all 206 digits:

12146304367025329675766243241881295855454217088483382315328918161829235892362167668831156960612640202170735835221294047782591091570411651472186029519906261646730733907419814952960000000000000000000000000000

What is the factorial of 124?
The factorial of 123 is not the only problem we can solve. Go here for the next number on our list that we have calculated the factorial of!