664274564 has 24 divisors (see below), whose sum is σ = 1183629888. Its totient is φ = 326143520.

The previous prime is 664274557. The next prime is 664274587. The reversal of 664274564 is 465472466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49454 + ... + 61434.

It is an arithmetic number, because the mean of its divisors is an integer number (49317912).

Almost surely, 2^664274564 is an apocalyptic number.

It is an amenable number.

664274564 is a deficient number, since it is larger than the sum of its proper divisors (519355324).

664274564 is a wasteful number, since it uses less digits than its factorization.

664274564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12235 (or 12233 counting only the distinct ones).

The product of its digits is 967680, while the sum is 44.

The square root of 664274564 is about 25773.5244776495. The cubic root of 664274564 is about 872.5343654688.

The spelling of 664274564 in words is "six hundred sixty-four million, two hundred seventy-four thousand, five hundred sixty-four".