## How to calculate the factorial of **55**

To find 55 factorial, or **55!**,
simply use the formula that multiplies the number 55 by all positive whole numbers less than it.

Let's look at how to calculate the Factorial of
**Fifty-five ** :

**55!** is exactly : **12696403353658275925965100847566516959580321051449436762275840000000000000**

Factorial of **55** can be calculated as:

**55!** = **55 x 54 x 53 x 52 x ... x 3 x 2 x 1**

The number of trailing zeros in
**55!** is **13**

The number of digits in **55** factorial is **74**.

## Factorials of Numbers similar to **55**

## What Is Factorial?

A factorial is showed by an integer and an exclamation symbol. In arithmetic, factorial is a multiplication function of natural numbers .

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

Symbolically, it is listed as "!".

The function is used, among other things, to find the "n" way objects can be structured .

## Factorial Formula

To find the factorial of any given number, change the exact value for n in the given equation :

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

The expansion of the formula shows the numbers to be multiplied together with each other to have the factorial of the number.

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

So the rule is : n! = n × (n−1)!

Example :

**55!** Factorial =
55 x 54 x 53 x 52 x ... x 3 x 2 x 1 =
55 × 54! =
12696403353658275925965100847566516959580321051449436762275840000000000000

## 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.