663720946 has 16 divisors (see below), whose sum is σ = 1139328576. Its totient is φ = 284071536.

The previous prime is 663720917. The next prime is 663720973. The reversal of 663720946 is 649027366.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20716 + ... + 41911.

It is an arithmetic number, because the mean of its divisors is an integer number (71208036).

Almost surely, 2^663720946 is an apocalyptic number.

663720946 is a deficient number, since it is larger than the sum of its proper divisors (475607630).

663720946 is a wasteful number, since it uses less digits than its factorization.

663720946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63393.

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 663720946 is about 25762.7821867127. The cubic root of 663720946 is about 872.2919029827.

The spelling of 663720946 in words is "six hundred sixty-three million, seven hundred twenty thousand, nine hundred forty-six".