7757

This number is a prime.

A prime of the form sod(1879^496+1955^496) + sod(1879^28+1955^28) - sod(1879^6+1955^6). Note that all the sums of digits (sods) in parenthesis are also primes (7457, 401, 101) and 6, 28, 496 are the first three perfect numbers. Einstein (1879-1955). [Sariyar]