51501615656 has 16 divisors (see below), whose sum is σ = 98811240000. Its totient is φ = 25151951664.

The previous prime is 51501615629. The next prime is 51501615661. The reversal of 51501615656 is 65651610515.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74856656 + ... + 74857343.

It is an arithmetic number, because the mean of its divisors is an integer number (6175702500).

Almost surely, 2^51501615656 is an apocalyptic number.

It is an amenable number.

51501615656 is a deficient number, since it is larger than the sum of its proper divisors (47309624344).

51501615656 is a wasteful number, since it uses less digits than its factorization.

51501615656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149714048 (or 149714044 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 51501615656 in words is "fifty-one billion, five hundred one million, six hundred fifteen thousand, six hundred fifty-six".