638582618456 has 64 divisors (see below), whose sum is σ = 1314465727680. Its totient is φ = 289906974720.

The previous prime is 638582618437. The next prime is 638582618461. The reversal of 638582618456 is 654816285836.

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 864761 + ... + 1423016.

It is an arithmetic number, because the mean of its divisors is an integer number (20538526995).

Almost surely, 2^638582618456 is an apocalyptic number.

It is an amenable number.

638582618456 is an abundant number, since it is smaller than the sum of its proper divisors (675883109224).

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

638582618456 is a wasteful number, since it uses less digits than its factorization.

638582618456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287884 (or 2287880 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 62.

The spelling of 638582618456 in words is "six hundred thirty-eight billion, five hundred eighty-two million, six hundred eighteen thousand, four hundred fifty-six".