638355382371 has 48 divisors (see below), whose sum is σ = 1063952008704. Its totient is φ = 361259926272.

The previous prime is 638355382363. The next prime is 638355382391. The reversal of 638355382371 is 173283553836.

638355382371 is a `hidden beast` number, since 6 + 3 + 8 + 3 + 553 + 82 + 3 + 7 + 1 = 666.

It is not a de Polignac number, because 638355382371 - 2³ = 638355382363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638355382321) 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, 26999371 + ... + 27023003.

It is an arithmetic number, because the mean of its divisors is an integer number (22165666848).

Almost surely, 2^638355382371 is an apocalyptic number.

638355382371 is a deficient number, since it is larger than the sum of its proper divisors (425596626333).

638355382371 is a wasteful number, since it uses less digits than its factorization.

638355382371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27760 (or 27757 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The spelling of 638355382371 in words is "six hundred thirty-eight billion, three hundred fifty-five million, three hundred eighty-two thousand, three hundred seventy-one".