657699664 has 10 divisors (see below), whose sum is σ = 1274293130. Its totient is φ = 328849824.

The previous prime is 657699619. The next prime is 657699761. The reversal of 657699664 is 466996756.

657699664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 575616064 + 82083600 = 23992^2 + 9060^2 .

It is a junction number, because it is equal to n+sod(n) for n = 657699599 and 657699608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20553099 + ... + 20553130.

It is an arithmetic number, because the mean of its divisors is an integer number (127429313).

Almost surely, 2^657699664 is an apocalyptic number.

It is an amenable number.

657699664 is a deficient number, since it is larger than the sum of its proper divisors (616593466).

657699664 is a wasteful number, since it uses less digits than its factorization.

657699664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41106237 (or 41106231 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 58.

The square root of 657699664 is about 25645.6558504555. The cubic root of 657699664 is about 869.6460726224.

The spelling of 657699664 in words is "six hundred fifty-seven million, six hundred ninety-nine thousand, six hundred sixty-four".