664321365 has 32 divisors (see below), whose sum is σ = 1194307200. Its totient is φ = 350317440.

The previous prime is 664321327. The next prime is 664321381. The reversal of 664321365 is 563123466.

664321365 is a `hidden beast` number, since 6 + 643 + 2 + 1 + 3 + 6 + 5 = 666.

It is not a de Polignac number, because 664321365 - 2⁸ = 664321109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15631 + ... + 39660.

It is an arithmetic number, because the mean of its divisors is an integer number (37322100).

Almost surely, 2^664321365 is an apocalyptic number.

It is an amenable number.

664321365 is a deficient number, since it is larger than the sum of its proper divisors (529985835).

664321365 is a wasteful number, since it uses less digits than its factorization.

664321365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55394 (or 55388 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 664321365 is about 25774.4323894824. The cubic root of 664321365 is about 872.5548562538.

The spelling of 664321365 in words is "six hundred sixty-four million, three hundred twenty-one thousand, three hundred sixty-five".