667704656 has 20 divisors (see below), whose sum is σ = 1300830804. Its totient is φ = 332006400.

The previous prime is 667704649. The next prime is 667704749. The reversal of 667704656 is 656407766.

667704656 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 2 ways, for example, as 2890000 + 664814656 = 1700^2 + 25784^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 667704656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112385 + ... + 118176.

Almost surely, 2^667704656 is an apocalyptic number.

It is an amenable number.

667704656 is a deficient number, since it is larger than the sum of its proper divisors (633126148).

667704656 is a wasteful number, since it uses less digits than its factorization.

667704656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230750 (or 230744 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 47.

The square root of 667704656 is about 25839.9817337397. The cubic root of 667704656 is about 874.0336132381.

The spelling of 667704656 in words is "six hundred sixty-seven million, seven hundred four thousand, six hundred fifty-six".