638582618500 has 48 divisors (see below), whose sum is σ = 1468067852160. Its totient is φ = 241989199200.

The previous prime is 638582618473. The next prime is 638582618501. The reversal of 638582618500 is 5816285836.

It is not an unprimeable number, because it can be changed into a prime (638582618501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33600112 + ... + 33619111.

It is an arithmetic number, because the mean of its divisors is an integer number (30584746920).

Almost surely, 2^638582618500 is an apocalyptic number.

It is an amenable number.

638582618500 is an abundant number, since it is smaller than the sum of its proper divisors (829485233660).

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

638582618500 is a wasteful number, since it uses less digits than its factorization.

638582618500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67219261 (or 67219249 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 638582618500 in words is "six hundred thirty-eight billion, five hundred eighty-two million, six hundred eighteen thousand, five hundred".