664567057 has 36 divisors (see below), whose sum is σ = 872108208. Its totient is φ = 500749200.

The previous prime is 664567051. The next prime is 664567087. The reversal of 664567057 is 750765466.

It is not a de Polignac number, because 664567057 - 2¹¹ = 664565009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664566998 and 664567016.

It is not an unprimeable number, because it can be changed into a prime (664567051) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 517338 + ... + 518620.

It is an arithmetic number, because the mean of its divisors is an integer number (24225228).

Almost surely, 2^664567057 is an apocalyptic number.

It is an amenable number.

664567057 is a deficient number, since it is larger than the sum of its proper divisors (207541151).

664567057 is a wasteful number, since it uses less digits than its factorization.

664567057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370 (or 1332 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 46.

The square root of 664567057 is about 25779.1981450161. The cubic root of 664567057 is about 872.6624112896.

The spelling of 664567057 in words is "six hundred sixty-four million, five hundred sixty-seven thousand, fifty-seven".