664994164 has 24 divisors (see below), whose sum is σ = 1197221760. Its totient is φ = 323034816.

The previous prime is 664994159. The next prime is 664994179. The reversal of 664994164 is 461499466.

It is a happy number.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12847 + ... + 38665.

It is an arithmetic number, because the mean of its divisors is an integer number (49884240).

Almost surely, 2^664994164 is an apocalyptic number.

It is an amenable number.

664994164 is a deficient number, since it is larger than the sum of its proper divisors (532227596).

664994164 is a wasteful number, since it uses less digits than its factorization.

664994164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26007 (or 26005 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 49.

The square root of 664994164 is about 25787.4807610205. The cubic root of 664994164 is about 872.8493201460.

The spelling of 664994164 in words is "six hundred sixty-four million, nine hundred ninety-four thousand, one hundred sixty-four".