6638684912 has 20 divisors (see below), whose sum is σ = 12976282560. Its totient is φ = 3289966848.

The previous prime is 6638684891. The next prime is 6638684917. The reversal of 6638684912 is 2194868366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638684917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1834112 + ... + 1837727.

It is an arithmetic number, because the mean of its divisors is an integer number (648814128).

Almost surely, 2^6638684912 is an apocalyptic number.

It is an amenable number.

6638684912 is a deficient number, since it is larger than the sum of its proper divisors (6337597648).

6638684912 is a wasteful number, since it uses less digits than its factorization.

6638684912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671960 (or 3671954 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 53.

The square root of 6638684912 is about 81478.1253588962. The cubic root of 6638684912 is about 1879.4351811628.

The spelling of 6638684912 in words is "six billion, six hundred thirty-eight million, six hundred eighty-four thousand, nine hundred twelve".