638011685379 has 48 divisors (see below), whose sum is σ = 907343724672. Its totient is φ = 398505744000.

The previous prime is 638011685371. The next prime is 638011685383. The reversal of 638011685379 is 973586110836.

It is not a de Polignac number, because 638011685379 - 2³ = 638011685371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638011685371) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15463992 + ... + 15505194.

It is an arithmetic number, because the mean of its divisors is an integer number (18902994264).

Almost surely, 2^638011685379 is an apocalyptic number.

638011685379 is a deficient number, since it is larger than the sum of its proper divisors (269332039293).

638011685379 is a wasteful number, since it uses less digits than its factorization.

638011685379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41440 (or 41409 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 638011685379 in words is "six hundred thirty-eight billion, eleven million, six hundred eighty-five thousand, three hundred seventy-nine".