663665504 has 12 divisors (see below), whose sum is σ = 1306591524. Its totient is φ = 331832736.

The previous prime is 663665501. The next prime is 663665549. The reversal of 663665504 is 405566366.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663665501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10369742 + ... + 10369805.

It is an arithmetic number, because the mean of its divisors is an integer number (108882627).

Almost surely, 2^663665504 is an apocalyptic number.

It is an amenable number.

663665504 is a deficient number, since it is larger than the sum of its proper divisors (642926020).

663665504 is a wasteful number, since it uses less digits than its factorization.

663665504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20739557 (or 20739549 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 41.

The square root of 663665504 is about 25761.7061546785. The cubic root of 663665504 is about 872.2676141835.

The spelling of 663665504 in words is "six hundred sixty-three million, six hundred sixty-five thousand, five hundred four".