664960057 has 4 divisors (see below), whose sum is σ = 666093456. Its totient is φ = 663826660.

The previous prime is 664960039. The next prime is 664960067. The reversal of 664960057 is 750069466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664960057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664959995 and 664960022.

It is not an unprimeable number, because it can be changed into a prime (664960007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565819 + ... + 566992.

It is an arithmetic number, because the mean of its divisors is an integer number (166523364).

Almost surely, 2^664960057 is an apocalyptic number.

It is an amenable number.

664960057 is a deficient number, since it is larger than the sum of its proper divisors (1133399).

664960057 is a wasteful number, since it uses less digits than its factorization.

664960057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133398.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 664960057 is about 25786.8194432737. The cubic root of 664960057 is about 872.8343973179.

The spelling of 664960057 in words is "six hundred sixty-four million, nine hundred sixty thousand, fifty-seven".