638882718367 has 8 divisors (see below), whose sum is σ = 646939263600. Its totient is φ = 630834724800.

The previous prime is 638882718361. The next prime is 638882718401. The reversal of 638882718367 is 763817288836.

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 638882718367 - 2¹⁹ = 638882194079 is a prime.

It is a super-2 number, since 2×638882718367² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638882718361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1987492 + ... + 2286457.

It is an arithmetic number, because the mean of its divisors is an integer number (80867407950).

Almost surely, 2^638882718367 is an apocalyptic number.

638882718367 is a deficient number, since it is larger than the sum of its proper divisors (8056545233).

638882718367 is a wasteful number, since it uses less digits than its factorization.

638882718367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4275833.

The product of its digits is 130056192, while the sum is 67.

The spelling of 638882718367 in words is "six hundred thirty-eight billion, eight hundred eighty-two million, seven hundred eighteen thousand, three hundred sixty-seven".