663943900 has 18 divisors (see below), whose sum is σ = 1440758480. Its totient is φ = 265577520.

The previous prime is 663943877. The next prime is 663943913. The reversal of 663943900 is 9349366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3319620 + ... + 3319819.

Almost surely, 2^663943900 is an apocalyptic number.

It is an amenable number.

663943900 is an abundant number, since it is smaller than the sum of its proper divisors (776814580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663943900 is a wasteful number, since it uses less digits than its factorization.

663943900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6639453 (or 6639446 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 663943900 is about 25767.1088793446. The cubic root of 663943900 is about 872.3895641045.

The spelling of 663943900 in words is "six hundred sixty-three million, nine hundred forty-three thousand, nine hundred".