663568164 has 36 divisors (see below), whose sum is σ = 1916975424. Its totient is φ = 189590832.

The previous prime is 663568159. The next prime is 663568211. The reversal of 663568164 is 461865366.

663568164 is a `hidden beast` number, since 6 + 635 + 6 + 8 + 1 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1316352 + ... + 1316855.

Almost surely, 2^663568164 is an apocalyptic number.

It is an amenable number.

663568164 is an abundant number, since it is smaller than the sum of its proper divisors (1253407260).

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

663568164 is a wasteful number, since it uses less digits than its factorization.

663568164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633224 (or 2633219 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 663568164 is about 25759.8168471750. The cubic root of 663568164 is about 872.2249668556.

The spelling of 663568164 in words is "six hundred sixty-three million, five hundred sixty-eight thousand, one hundred sixty-four".