664012164 has 24 divisors (see below), whose sum is σ = 1571185728. Its totient is φ = 218219680.

The previous prime is 664012127. The next prime is 664012199. The reversal of 664012164 is 461210466.

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, 388827 + ... + 390530.

It is an arithmetic number, because the mean of its divisors is an integer number (65466072).

Almost surely, 2^664012164 is an apocalyptic number.

It is an amenable number.

664012164 is an abundant number, since it is smaller than the sum of its proper divisors (907173564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664012164 is a wasteful number, since it uses less digits than its factorization.

664012164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779435 (or 779433 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 664012164 is about 25768.4334797442. The cubic root of 664012164 is about 872.4194615905.

The spelling of 664012164 in words is "six hundred sixty-four million, twelve thousand, one hundred sixty-four".