656647746656 has 48 divisors (see below), whose sum is σ = 1455793855488. Its totient is φ = 288847977600.

The previous prime is 656647746649. The next prime is 656647746673.

656647746656 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30077420 + ... + 30099243.

It is an arithmetic number, because the mean of its divisors is an integer number (30329038656).

Almost surely, 2^656647746656 is an apocalyptic number.

It is an amenable number.

656647746656 is an abundant number, since it is smaller than the sum of its proper divisors (799146108832).

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

656647746656 is a wasteful number, since it uses less digits than its factorization.

656647746656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60176715 (or 60176707 counting only the distinct ones).

The product of its digits is 914457600, while the sum is 68.

The spelling of 656647746656 in words is "six hundred fifty-six billion, six hundred forty-seven million, seven hundred forty-six thousand, six hundred fifty-six".