656465856 has 56 divisors (see below), whose sum is σ = 1748479104. Its totient is φ = 217363200.

The previous prime is 656465851. The next prime is 656465867. The reversal of 656465856 is 658564656.

It is a junction number, because it is equal to n+sod(n) for n = 656465799 and 656465808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656465851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17671 + ... + 40313.

Almost surely, 2^656465856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656465856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (874239552).

656465856 is an abundant number, since it is smaller than the sum of its proper divisors (1092013248).

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

656465856 is a wasteful number, since it uses less digits than its factorization.

656465856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22809 (or 22799 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 51.

The square root of 656465856 is about 25621.5896462339. The cubic root of 656465856 is about 869.1019296605.

The spelling of 656465856 in words is "six hundred fifty-six million, four hundred sixty-five thousand, eight hundred fifty-six".