The largest known PRIME number has 22,338,618 digits!!

It was confirmed on January 7th of 2018.

The number is 

274,207,281 - 1

274,207,281 is not a prime number.

It is an even number because all the 2’s are multiplied together.

The last digit of 274,207,281 is 2.

The new prime number is 274,207,281- 1.

So the last digit of the new largest prime number is 2-1 = 1

We can now find the largest known PERFECT Number!

It is 

(274,207,281 – 1)( 274,207,280)

The formula for PERFECT numbers is P = (2n– 1)( 2n-1) providing  

(2n– 1) is a prime.

The last digit of the largest known PERFECT number

should be 1 x 6 = 6.        It is!! All PERFECT numbers end is 6 or 8.

Extra News!

The new Maths Digest has just been published on

It has well over 1000 pages and is over 648Mb in size.