663512644 has 12 divisors (see below), whose sum is σ = 1162851984. Its totient is φ = 331269224.

The previous prime is 663512621. The next prime is 663512651. The reversal of 663512644 is 446215366.

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 3 ways as a sum of consecutive naturals, for example, 118702 + ... + 124165.

It is an arithmetic number, because the mean of its divisors is an integer number (96904332).

Almost surely, 2^663512644 is an apocalyptic number.

It is an amenable number.

663512644 is a deficient number, since it is larger than the sum of its proper divisors (499339340).

663512644 is a wasteful number, since it uses less digits than its factorization.

663512644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243554 (or 243552 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

The square root of 663512644 is about 25758.7391772191. The cubic root of 663512644 is about 872.2006401507.

The spelling of 663512644 in words is "six hundred sixty-three million, five hundred twelve thousand, six hundred forty-four".