639118522361 has 4 divisors (see below), whose sum is σ = 697220206224. Its totient is φ = 581016838500.

The previous prime is 639118522319. The next prime is 639118522369. The reversal of 639118522361 is 163225811936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 639118522361 - 2¹⁰ = 639118521337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639118522369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29050841915 + ... + 29050841936.

It is an arithmetic number, because the mean of its divisors is an integer number (174305051556).

Almost surely, 2^639118522361 is an apocalyptic number.

It is an amenable number.

639118522361 is a deficient number, since it is larger than the sum of its proper divisors (58101683863).

639118522361 is a wasteful number, since it uses less digits than its factorization.

639118522361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58101683862.

The product of its digits is 466560, while the sum is 47.

The spelling of 639118522361 in words is "six hundred thirty-nine billion, one hundred eighteen million, five hundred twenty-two thousand, three hundred sixty-one".