663385988 has 48 divisors (see below), whose sum is σ = 1267069440. Its totient is φ = 303060960.

The previous prime is 663385981. The next prime is 663385997. The reversal of 663385988 is 889583366.

663385988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×663385988² = 880161938149472288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663385981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2263970 + ... + 2264262.

It is an arithmetic number, because the mean of its divisors is an integer number (26397280).

Almost surely, 2^663385988 is an apocalyptic number.

It is an amenable number.

663385988 is a deficient number, since it is larger than the sum of its proper divisors (603683452).

663385988 is a wasteful number, since it uses less digits than its factorization.

663385988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 345 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 56.

The square root of 663385988 is about 25756.2805544589. The cubic root of 663385988 is about 872.1451393374.

The spelling of 663385988 in words is "six hundred sixty-three million, three hundred eighty-five thousand, nine hundred eighty-eight".