656612019856 has 45 divisors (see below), whose sum is σ = 1377662368329. Its totient is φ = 303032253888.

The previous prime is 656612019841. The next prime is 656612019883. The reversal of 656612019856 is 658910216656.

The square root of 656612019856 is 810316.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 97131955600 + 559480064256 = 311660^2 + 747984^2 .

It is a super-2 number, since 2×656612019856² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656612019797 and 656612019806.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 42128641 + ... + 42144223.

Almost surely, 2^656612019856 is an apocalyptic number.

656612019856 is the 810316-th square number.

It is an amenable number.

656612019856 is an abundant number, since it is smaller than the sum of its proper divisors (721050348473).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656612019856 is an frugal number, since it uses more digits than its factorization.

656612019856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31200 (or 15598 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 656612019856 in words is "six hundred fifty-six billion, six hundred twelve million, nineteen thousand, eight hundred fifty-six".