638374666844 has 24 divisors (see below), whose sum is σ = 1176865813200. Its totient is φ = 302153362560.

The previous prime is 638374666799. The next prime is 638374666849. The reversal of 638374666844 is 448666473836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638374666849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3160247 + ... + 3356174.

It is an arithmetic number, because the mean of its divisors is an integer number (49036075550).

Almost surely, 2^638374666844 is an apocalyptic number.

It is an amenable number.

638374666844 is a deficient number, since it is larger than the sum of its proper divisors (538491146356).

638374666844 is a wasteful number, since it uses less digits than its factorization.

638374666844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6517733 (or 6517731 counting only the distinct ones).

The product of its digits is 334430208, while the sum is 65.

The spelling of 638374666844 in words is "six hundred thirty-eight billion, three hundred seventy-four million, six hundred sixty-six thousand, eight hundred forty-four".