664612956 has 36 divisors (see below), whose sum is σ = 1919993712. Its totient is φ = 189889344.

The previous prime is 664612939. The next prime is 664612969. The reversal of 664612956 is 659216466.

664612956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1318425 + ... + 1318928.

Almost surely, 2^664612956 is an apocalyptic number.

It is an amenable number.

664612956 is an abundant number, since it is smaller than the sum of its proper divisors (1255380756).

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

664612956 is a wasteful number, since it uses less digits than its factorization.

664612956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2637370 (or 2637365 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 664612956 is about 25780.0883629207. The cubic root of 664612956 is about 872.6825012662.

The spelling of 664612956 in words is "six hundred sixty-four million, six hundred twelve thousand, nine hundred fifty-six".