663983558 has 16 divisors (see below), whose sum is σ = 1139857920. Its totient is φ = 284164296.

The previous prime is 663983543. The next prime is 663983563. The reversal of 663983558 is 855389366.

It is a congruent number.

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, 22916 + ... + 43047.

It is an arithmetic number, because the mean of its divisors is an integer number (71241120).

Almost surely, 2^663983558 is an apocalyptic number.

663983558 is a deficient number, since it is larger than the sum of its proper divisors (475874362).

663983558 is a wasteful number, since it uses less digits than its factorization.

663983558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66691.

The product of its digits is 4665600, while the sum is 53.

The square root of 663983558 is about 25767.8784148016. The cubic root of 663983558 is about 872.4069333113.

The spelling of 663983558 in words is "six hundred sixty-three million, nine hundred eighty-three thousand, five hundred fifty-eight".