656212516464 has 40 divisors (see below), whose sum is σ = 1697189249920. Its totient is φ = 218482849728.

The previous prime is 656212516447. The next prime is 656212516513. The reversal of 656212516464 is 464615212656.

It is a happy number.

It is a super-2 number, since 2×656212516464² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7916332 + ... + 7998795.

It is an arithmetic number, because the mean of its divisors is an integer number (42429731248).

Almost surely, 2^656212516464 is an apocalyptic number.

It is an amenable number.

656212516464 is an abundant number, since it is smaller than the sum of its proper divisors (1040976733456).

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

656212516464 is a wasteful number, since it uses less digits than its factorization.

656212516464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15915997 (or 15915991 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 48.

The spelling of 656212516464 in words is "six hundred fifty-six billion, two hundred twelve million, five hundred sixteen thousand, four hundred sixty-four".