656641025898672 has 20 divisors (see below), whose sum is σ = 1696322650238360. Its totient is φ = 218880341966208.

The previous prime is 656641025898631. The next prime is 656641025898707. The reversal of 656641025898672 is 276898520146656.

656641025898672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×656641025898672² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656641025898594 and 656641025898603.

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, 6840010686397 + ... + 6840010686492.

It is an arithmetic number, because the mean of its divisors is an integer number (84816132511918).

Almost surely, 2^{656641025898672} is an apocalyptic number.

It is an amenable number.

656641025898672 is an abundant number, since it is smaller than the sum of its proper divisors (1039681624339688).

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

656641025898672 is a wasteful number, since it uses less digits than its factorization.

656641025898672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13680021372900 (or 13680021372894 counting only the distinct ones).

The product of its (nonzero) digits is 2090188800, while the sum is 75.

The spelling of 656641025898672 in words is "six hundred fifty-six trillion, six hundred forty-one billion, twenty-five million, eight hundred ninety-eight thousand, six hundred seventy-two".