639705867833087 has 8 divisors (see below), whose sum is σ = 697872793052880. Its totient is φ = 581540917000960.

The previous prime is 639705867833033. The next prime is 639705867833161. The reversal of 639705867833087 is 780338768507936.

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 639705867833087 - 2³⁴ = 639688687963903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639705867833017) 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, 492919412 + ... + 494215497.

It is an arithmetic number, because the mean of its divisors is an integer number (87234099131610).

Almost surely, 2^{639705867833087} is an apocalyptic number.

639705867833087 is a deficient number, since it is larger than the sum of its proper divisors (58166925219793).

639705867833087 is a wasteful number, since it uses less digits than its factorization.

639705867833087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987193833.

The product of its (nonzero) digits is 7681443840, while the sum is 80.

The spelling of 639705867833087 in words is "six hundred thirty-nine trillion, seven hundred five billion, eight hundred sixty-seven million, eight hundred thirty-three thousand, eighty-seven".