664599868 has 6 divisors (see below), whose sum is σ = 1163049776. Its totient is φ = 332299932.

The previous prime is 664599857. The next prime is 664599869. The reversal of 664599868 is 868995466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664599869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83074980 + ... + 83074987.

Almost surely, 2^664599868 is an apocalyptic number.

It is an amenable number.

664599868 is a deficient number, since it is larger than the sum of its proper divisors (498449908).

664599868 is a wasteful number, since it uses less digits than its factorization.

664599868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166149971 (or 166149969 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 61.

The square root of 664599868 is about 25779.8345223549. The cubic root of 664599868 is about 872.6767727474.

The spelling of 664599868 in words is "six hundred sixty-four million, five hundred ninety-nine thousand, eight hundred sixty-eight".