638863471712 has 48 divisors (see below), whose sum is σ = 1336107049200. Its totient is φ = 299843182080.

The previous prime is 638863471703. The next prime is 638863471739. The reversal of 638863471712 is 217174368836.

It is a happy number.

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, 4753739 + ... + 4886282.

It is an arithmetic number, because the mean of its divisors is an integer number (27835563525).

Almost surely, 2^638863471712 is an apocalyptic number.

It is an amenable number.

638863471712 is an abundant number, since it is smaller than the sum of its proper divisors (697243577488).

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

638863471712 is a wasteful number, since it uses less digits than its factorization.

638863471712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9640159 (or 9640151 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 56.

The spelling of 638863471712 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, four hundred seventy-one thousand, seven hundred twelve".