656940944064 has 56 divisors (see below), whose sum is σ = 1738242578880. Its totient is φ = 218969438464.

The previous prime is 656940944047. The next prime is 656940944071. The reversal of 656940944064 is 460449049656.

It is a junction number, because it is equal to n+sod(n) for n = 656940943995 and 656940944013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4407787 + ... + 4554389.

Almost surely, 2^656940944064 is an apocalyptic number.

656940944064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

656940944064 is an abundant number, since it is smaller than the sum of its proper divisors (1081301634816).

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

656940944064 is a wasteful number, since it uses less digits than its factorization.

656940944064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169957 (or 169947 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 57.

The spelling of 656940944064 in words is "six hundred fifty-six billion, nine hundred forty million, nine hundred forty-four thousand, sixty-four".