638582634385 has 8 divisors (see below), whose sum is σ = 766383805440. Its totient is φ = 510809678064.

The previous prime is 638582634337. The next prime is 638582634401. The reversal of 638582634385 is 583436285836.

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

It is a cyclic number.

It is not a de Polignac number, because 638582634385 - 2¹⁵ = 638582601617 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7003857 + ... + 7094446.

It is an arithmetic number, because the mean of its divisors is an integer number (95797975680).

Almost surely, 2^638582634385 is an apocalyptic number.

It is an amenable number.

638582634385 is a deficient number, since it is larger than the sum of its proper divisors (127801171055).

638582634385 is a wasteful number, since it uses less digits than its factorization.

638582634385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14107367.

The product of its digits is 99532800, while the sum is 61.

The spelling of 638582634385 in words is "six hundred thirty-eight billion, five hundred eighty-two million, six hundred thirty-four thousand, three hundred eighty-five".