638844848556 has 48 divisors (see below), whose sum is σ = 1531444289760. Its totient is φ = 207122711040.

The previous prime is 638844848533. The next prime is 638844848573. The reversal of 638844848556 is 655848448836.

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, 1075926 + ... + 1560546.

It is an arithmetic number, because the mean of its divisors is an integer number (31905089370).

Almost surely, 2^638844848556 is an apocalyptic number.

It is an amenable number.

638844848556 is an abundant number, since it is smaller than the sum of its proper divisors (892599441204).

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

638844848556 is a wasteful number, since it uses less digits than its factorization.

638844848556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487634 (or 487632 counting only the distinct ones).

The product of its digits is 707788800, while the sum is 69.

The spelling of 638844848556 in words is "six hundred thirty-eight billion, eight hundred forty-four million, eight hundred forty-eight thousand, five hundred fifty-six".