663960564 has 36 divisors (see below), whose sum is σ = 1740508224. Its totient is φ = 221319864.

The previous prime is 663960509. The next prime is 663960593. The reversal of 663960564 is 465069366.

663960564 is a `hidden beast` number, since 6 + 6 + 39 + 605 + 6 + 4 = 666.

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

It is a congruent number.

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, 340572 + ... + 342515.

Almost surely, 2^663960564 is an apocalyptic number.

It is an amenable number.

663960564 is an abundant number, since it is smaller than the sum of its proper divisors (1076547660).

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

663960564 is a wasteful number, since it uses less digits than its factorization.

663960564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683106 (or 683092 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The square root of 663960564 is about 25767.4322352849. The cubic root of 663960564 is about 872.3968626017.

The spelling of 663960564 in words is "six hundred sixty-three million, nine hundred sixty thousand, five hundred sixty-four".