What is 65 factorial ?

To find 65 factorial, or 65!, simply use the formula that multiplies the number 65 by all positive whole numbers less than it.

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

  65! is exactly : 8247650592082470666723170306785496252186258551345437492922123134388955774976000000000000000

  Factorial of 65 can be calculated as:
65! = 65 x 64 x 63 x 62 x ... x 3 x 2 x 1

  The number of trailing zeros in 65! is 15

  The number of digits in 65 factorial is 91.

• 61 Factorial
• 62 Factorial
• 63 Factorial
• 64 Factorial
• Factorial of 66
• Factorial of 67
• Factorial of 68
• Factorial of 69

A factorial is displayed by an integer and an exclamation symbol. In Mathematics, factorial is a multiplication procedure 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 find the "n" way items can be established .

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

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

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

We can also determine a factorial from the previous 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 :
65! Factorial = 65 x 64 x 63 x 62 x ... x 3 x 2 x 1 = 65 × 64! = 8247650592082470666723170306785496252186258551345437492922123134388955774976000000000000000

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"

65 in French

65 in English

Factors of 65