664612957 has 8 divisors (see below), whose sum is σ = 667162656. Its totient is φ = 662069232.

The previous prime is 664612939. The next prime is 664612969. The reversal of 664612957 is 759216466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664612957 - 2¹⁹ = 664088669 is a prime.

It is a super-2 number, since 2×664612957² = 883420765224567698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664612987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379558 + ... + 381304.

It is an arithmetic number, because the mean of its divisors is an integer number (83395332).

Almost surely, 2^664612957 is an apocalyptic number.

It is an amenable number.

664612957 is a deficient number, since it is larger than the sum of its proper divisors (2549699).

664612957 is a wasteful number, since it uses less digits than its factorization.

664612957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2987.

The product of its digits is 544320, while the sum is 46.

The square root of 664612957 is about 25780.0883823155. The cubic root of 664612957 is about 872.6825017039.

The spelling of 664612957 in words is "six hundred sixty-four million, six hundred twelve thousand, nine hundred fifty-seven".