656664657 has 8 divisors (see below), whose sum is σ = 955148640. Its totient is φ = 397978560.

The previous prime is 656664649. The next prime is 656664667. The reversal of 656664657 is 756466656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 656664657 - 2³ = 656664649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656664667) 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, 9949432 + ... + 9949497.

It is an arithmetic number, because the mean of its divisors is an integer number (119393580).

Almost surely, 2^656664657 is an apocalyptic number.

It is an amenable number.

656664657 is a deficient number, since it is larger than the sum of its proper divisors (298483983).

656664657 is a wasteful number, since it uses less digits than its factorization.

656664657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19898943.

The product of its digits is 5443200, while the sum is 51.

The square root of 656664657 is about 25625.4689127828. The cubic root of 656664657 is about 869.1896523719.

The spelling of 656664657 in words is "six hundred fifty-six million, six hundred sixty-four thousand, six hundred fifty-seven".