657494664 has 32 divisors (see below), whose sum is σ = 1644477120. Its totient is φ = 219066176.

The previous prime is 657494659. The next prime is 657494683. The reversal of 657494664 is 466494756.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64954 + ... + 74390.

It is an arithmetic number, because the mean of its divisors is an integer number (51389910).

Almost surely, 2^657494664 is an apocalyptic number.

It is an amenable number.

657494664 is an abundant number, since it is smaller than the sum of its proper divisors (986982456).

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

657494664 is a wasteful number, since it uses less digits than its factorization.

657494664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12349 (or 12345 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 51.

The square root of 657494664 is about 25641.6587606964. The cubic root of 657494664 is about 869.5557092036. Note that the first 3 decimals are identical.

The spelling of 657494664 in words is "six hundred fifty-seven million, four hundred ninety-four thousand, six hundred sixty-four".