656645607 has 12 divisors (see below), whose sum is σ = 989727024. Its totient is φ = 418730400.

The previous prime is 656645581. The next prime is 656645611. The reversal of 656645607 is 706546656.

It is not a de Polignac number, because 656645607 - 2¹² = 656641511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656645657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1585894 + ... + 1586307.

It is an arithmetic number, because the mean of its divisors is an integer number (82477252).

Almost surely, 2^656645607 is an apocalyptic number.

656645607 is a deficient number, since it is larger than the sum of its proper divisors (333081417).

656645607 is a wasteful number, since it uses less digits than its factorization.

656645607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3172230 (or 3172227 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The square root of 656645607 is about 25625.0972095717. The cubic root of 656645607 is about 869.1812471569.

The spelling of 656645607 in words is "six hundred fifty-six million, six hundred forty-five thousand, six hundred seven".