663131956 has 12 divisors (see below), whose sum is σ = 1169340480. Its totient is φ = 329034680.

The previous prime is 663131941. The next prime is 663131993. The reversal of 663131956 is 659131366.

663131956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632236 + ... + 633283.

It is an arithmetic number, because the mean of its divisors is an integer number (97445040).

Almost surely, 2^663131956 is an apocalyptic number.

It is an amenable number.

663131956 is a deficient number, since it is larger than the sum of its proper divisors (506208524).

663131956 is a wasteful number, since it uses less digits than its factorization.

663131956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265654 (or 1265652 counting only the distinct ones).

The product of its digits is 87480, while the sum is 40.

The square root of 663131956 is about 25751.3486248779. The cubic root of 663131956 is about 872.0338009090.

The spelling of 663131956 in words is "six hundred sixty-three million, one hundred thirty-one thousand, nine hundred fifty-six".