638844866862 has 8 divisors (see below), whose sum is σ = 1277689733736. Its totient is φ = 212948288952.

The previous prime is 638844866843. The next prime is 638844866873. The reversal of 638844866862 is 268668448836.

638844866862 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

638844866862 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53237072233 + ... + 53237072244.

It is an arithmetic number, because the mean of its divisors is an integer number (159711216717).

Almost surely, 2^638844866862 is an apocalyptic number.

638844866862 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

638844866862 is a wasteful number, since it uses less digits than its factorization.

638844866862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106474144482.

The product of its digits is 509607936, while the sum is 69.

The spelling of 638844866862 in words is "six hundred thirty-eight billion, eight hundred forty-four million, eight hundred sixty-six thousand, eight hundred sixty-two".