656021677672 has 32 divisors (see below), whose sum is σ = 1233928519200. Its totient is φ = 326975068224.

The previous prime is 656021677657. The next prime is 656021677709. The reversal of 656021677672 is 276776120656.

656021677672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5300803 + ... + 5423149.

It is an arithmetic number, because the mean of its divisors is an integer number (38560266225).

Almost surely, 2^656021677672 is an apocalyptic number.

It is an amenable number.

656021677672 is a deficient number, since it is larger than the sum of its proper divisors (577906841528).

656021677672 is a wasteful number, since it uses less digits than its factorization.

656021677672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124465 (or 124461 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 55.

The spelling of 656021677672 in words is "six hundred fifty-six billion, twenty-one million, six hundred seventy-seven thousand, six hundred seventy-two".