656213215556 has 48 divisors (see below), whose sum is σ = 1204409606400. Its totient is φ = 312243773952.

The previous prime is 656213215549. The next prime is 656213215571. The reversal of 656213215556 is 655512312656.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 656213215556.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28262480 + ... + 28285688.

It is an arithmetic number, because the mean of its divisors is an integer number (25091866800).

Almost surely, 2^656213215556 is an apocalyptic number.

It is an amenable number.

656213215556 is a deficient number, since it is larger than the sum of its proper divisors (548196390844).

656213215556 is a wasteful number, since it uses less digits than its factorization.

656213215556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24788 (or 24786 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 47.

The spelling of 656213215556 in words is "six hundred fifty-six billion, two hundred thirteen million, two hundred fifteen thousand, five hundred fifty-six".