The exact factorial of 91 is:

135200152767840296255166568759495142147586866476906677791741734597153670771559994765685283954750449427751168336768008192000000000000000000000

📌 Number of digits in the exact factorial of 91! = 141.

Approximately, the value of 91! can also be written as 1.352001527 E+140.

## How to calculate 91!

The formula for finding the factorial of a number is:

n! = n × (n-1) × (n-2) × … × 2 × 1

The same formula can also be written in terms of PI product notation as: So, by definition, 91! is calculated as:

91 × 90 × 89 × … × 2 × 1

Also see:

### How many digits are there in the exact value of 91!?

There are 141 digits in the exact value of 91!.

### What is the value of 91 factorial in terms of E?

The value of 91! in terms of E is 1.352001527 E+140.

### What are the uses of factorials?

According to Wikipedia:

In mathematical analysis, factorials are used in power series for the exponential function and other functions, and they also have applications in algebra, number theory, probability theory, and computer science.