664165608 has 32 divisors (see below), whose sum is σ = 1661536800. Its totient is φ = 221238848.

The previous prime is 664165591. The next prime is 664165609. The reversal of 664165608 is 806561466.

It is a super-2 number, since 2×664165608² = 882231909700019328, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 664165608.

It is not an unprimeable number, because it can be changed into a prime (664165609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30310 + ... + 47402.

It is an arithmetic number, because the mean of its divisors is an integer number (51923025).

Almost surely, 2^664165608 is an apocalyptic number.

It is an amenable number.

664165608 is an abundant number, since it is smaller than the sum of its proper divisors (997371192).

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

664165608 is a wasteful number, since it uses less digits than its factorization.

664165608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18721 (or 18717 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 664165608 is about 25771.4106715174. The cubic root of 664165608 is about 872.4866577599.

The spelling of 664165608 in words is "six hundred sixty-four million, one hundred sixty-five thousand, six hundred eight".