656642712452 has 12 divisors (see below), whose sum is σ = 1149138215820. Its totient is φ = 328317507936.

The previous prime is 656642712443. The next prime is 656642712499. The reversal of 656642712452 is 254217246656.

It can be written as a sum of positive squares in 2 ways, for example, as 144009624196 + 512633088256 = 379486^2 + 715984^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 656642712452.

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, 559427 + ... + 1275242.

It is an arithmetic number, because the mean of its divisors is an integer number (95761517985).

Almost surely, 2^656642712452 is an apocalyptic number.

It is an amenable number.

656642712452 is a deficient number, since it is larger than the sum of its proper divisors (492495503368).

656642712452 is a wasteful number, since it uses less digits than its factorization.

656642712452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924150 (or 1924148 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 50.

The spelling of 656642712452 in words is "six hundred fifty-six billion, six hundred forty-two million, seven hundred twelve thousand, four hundred fifty-two".