51636767522 has 6 divisors (see below), whose sum is σ = 77455633329. Its totient is φ = 25818223080.

The previous prime is 51636767503. The next prime is 51636767531. The reversal of 51636767522 is 22576763615.

It can be written as a sum of positive squares in 2 ways, for example, as 49528947601 + 2107819921 = 222551^2 + 45911^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=160681.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 241022 + ... + 401702.

Almost surely, 2^51636767522 is an apocalyptic number.

51636767522 is a deficient number, since it is larger than the sum of its proper divisors (25818865807).

51636767522 is an frugal number, since it uses more digits than its factorization.

51636767522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321364 (or 160683 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 50.

Multiplying 51636767522 by its sum of digits (50), we get a square (2581838376100 = 1606810²).

The spelling of 51636767522 in words is "fifty-one billion, six hundred thirty-six million, seven hundred sixty-seven thousand, five hundred twenty-two".