639815342271 has 8 divisors (see below), whose sum is σ = 974956712064. Its totient is φ = 365608767000.

The previous prime is 639815342263. The next prime is 639815342297. The reversal of 639815342271 is 172243518936.

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

It is not a de Polignac number, because 639815342271 - 2³ = 639815342263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639815302271) 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, 15233698605 + ... + 15233698646.

It is an arithmetic number, because the mean of its divisors is an integer number (121869589008).

Almost surely, 2^639815342271 is an apocalyptic number.

639815342271 is a deficient number, since it is larger than the sum of its proper divisors (335141369793).

639815342271 is a wasteful number, since it uses less digits than its factorization.

639815342271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30467397261.

The product of its digits is 2177280, while the sum is 51.

The spelling of 639815342271 in words is "six hundred thirty-nine billion, eight hundred fifteen million, three hundred forty-two thousand, two hundred seventy-one".