664643416 has 16 divisors (see below), whose sum is σ = 1261222200. Its totient is φ = 328317504.

The previous prime is 664643383. The next prime is 664643423. The reversal of 664643416 is 614346466.

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 3 ways as a sum of consecutive naturals, for example, 499821 + ... + 501148.

Almost surely, 2^664643416 is an apocalyptic number.

It is an amenable number.

664643416 is a deficient number, since it is larger than the sum of its proper divisors (596578784).

664643416 is a wasteful number, since it uses less digits than its factorization.

664643416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001058 (or 1001054 counting only the distinct ones).

The product of its digits is 248832, while the sum is 40.

The square root of 664643416 is about 25780.6791221643. The cubic root of 664643416 is about 872.6958330872.

The spelling of 664643416 in words is "six hundred sixty-four million, six hundred forty-three thousand, four hundred sixteen".