656545456565456 has 20 divisors (see below), whose sum is σ = 1272434175158304. Its totient is φ = 328175346847200.

The previous prime is 656545456565441. The next prime is 656545456565477. The reversal of 656545456565456 is 654565654545656.

656545456565456 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a super-2 number, since 2×656545456565456² (a number of 30 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

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, 6086284100 + ... + 6086391971.

Almost surely, 2^{656545456565456} is an apocalyptic number.

It is an amenable number.

656545456565456 is a deficient number, since it is larger than the sum of its proper divisors (615888718592848).

656545456565456 is a wasteful number, since it uses less digits than its factorization.

656545456565456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12172679450 (or 12172679444 counting only the distinct ones).

The product of its digits is 38880000000, while the sum is 77.

The spelling of 656545456565456 in words is "six hundred fifty-six trillion, five hundred forty-five billion, four hundred fifty-six million, five hundred sixty-five thousand, four hundred fifty-six".