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.