638583111665 has 8 divisors (see below), whose sum is σ = 791019080448. Its totient is φ = 494386925040.

The previous prime is 638583111659. The next prime is 638583111709. The reversal of 638583111665 is 566111385836.

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

It is not a de Polignac number, because 638583111665 - 2⁶ = 638583111601 is a prime.

It is a Duffinian number.

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, 2059945367 + ... + 2059945676.

It is an arithmetic number, because the mean of its divisors is an integer number (98877385056).

Almost surely, 2^638583111665 is an apocalyptic number.

It is an amenable number.

638583111665 is a deficient number, since it is larger than the sum of its proper divisors (152435968783).

638583111665 is a wasteful number, since it uses less digits than its factorization.

638583111665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119891079.

The product of its digits is 3110400, while the sum is 53.

The spelling of 638583111665 in words is "six hundred thirty-eight billion, five hundred eighty-three million, one hundred eleven thousand, six hundred sixty-five".