# What is 69 factorial ?

Steps to calculate factorial of 69

## How to calculate the factorial of 69

To find 69 factorial, or 69!, simply use the formula that multiplies the number 69 by all positive whole numbers less than it.

Let's look at how to calculate the Factorial of Sixty-nine :

69! is exactly : 171122452428141311372468338881272839092270544893520369393648040923257279754140647424000000000000000

Factorial of 69 can be calculated as:
69! = 69 x 68 x 67 x 66 x ... x 3 x 2 x 1

The number of trailing zeros in 69! is 16

The number of digits in 69 factorial is 99.

## What Is Factorial?

A factorial is displayed by an integer and an exclamation symbol. In math concepts, factorial is a multiplication process of natural numbers .

It multiplies the number by every noreal number that is less than it .

Symbolically, it is displayed as "!".

The function is used, among other things, to get the "n" way items can be organized .

## Factorial Formula

To find the factorial of any given number, replace the exact value for n in the given method :

n! = n × (n-1) × (n-2) × (n-3) × ….× 3 × 2 × 1

The expansion of the formula provides numbers to be replicated at the same time to find the factorial of the number.

We can also measure a factorial from the prior one. The factorial of any number is that number multiplied the factorial of (that number minus 1).

So the rule is : n! = n × (n−1)!

Example :
69! Factorial = 69 x 68 x 67 x 66 x ... x 3 x 2 x 1 = 69 × 68! = 171122452428141311372468338881272839092270544893520369393648040923257279754140647424000000000000000

## What are Factorials Used For?

The best use of factorial is in Combinations and Permutations.

Example : Determine how to arrange letters without repeating?

There one way for 1 letter "a":
2 ways for two letters "ab": ab, ba.
There are 6 ways for 3 letters "abc": abc acb cab bac bca.
There are 24 ways for 1234 of the letters "abcd"

## Frequently Asked Questions on Factorial

### Can we have factorials for negative numbers ?

Negative number factorials are undefined

### What Is 0!

Zero factorial or Factorial of 0 is simple, and its value is equal to 1. So, 0! = 1.