638717568142 has 8 divisors (see below), whose sum is σ = 958103505216. Its totient is φ = 319349733072.

The previous prime is 638717568133. The next prime is 638717568157. The reversal of 638717568142 is 241865717836.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4436943 + ... + 4578634.

It is an arithmetic number, because the mean of its divisors is an integer number (119762938152).

Almost surely, 2^638717568142 is an apocalyptic number.

638717568142 is a deficient number, since it is larger than the sum of its proper divisors (319385937074).

638717568142 is a wasteful number, since it uses less digits than its factorization.

638717568142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9051002.

The product of its digits is 13547520, while the sum is 58.

The spelling of 638717568142 in words is "six hundred thirty-eight billion, seven hundred seventeen million, five hundred sixty-eight thousand, one hundred forty-two".