6531663900 has 72 divisors (see below), whose sum is σ = 18910428544. Its totient is φ = 1740657600.

The previous prime is 6531663899. The next prime is 6531663913. The reversal of 6531663900 is 93661356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 528795 + ... + 541005.

Almost surely, 2^6531663900 is an apocalyptic number.

6531663900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6531663900 is an abundant number, since it is smaller than the sum of its proper divisors (12378764644).

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

6531663900 is a wasteful number, since it uses less digits than its factorization.

6531663900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14011 (or 14004 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 39.

The square root of 6531663900 is about 80818.7100862170. The cubic root of 6531663900 is about 1869.2810776065.

The spelling of 6531663900 in words is "six billion, five hundred thirty-one million, six hundred sixty-three thousand, nine hundred".