639369181963936 has 48 divisors (see below), whose sum is σ = 1273935295198944. Its totient is φ = 315830128662784.

The previous prime is 639369181963933. The next prime is 639369181963979.

639369181963936 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×639369181963936² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639369181963936.

It is not an unprimeable number, because it can be changed into a prime (639369181963933) 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, 311223510 + ... + 313271146.

It is an arithmetic number, because the mean of its divisors is an integer number (26540318649978).

Almost surely, 2^{639369181963936} is an apocalyptic number.

It is an amenable number.

639369181963936 is a deficient number, since it is larger than the sum of its proper divisors (634566113235008).

639369181963936 is a wasteful number, since it uses less digits than its factorization.

639369181963936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165293 (or 2165285 counting only the distinct ones).

The product of its digits is 5509980288, while the sum is 82.

The spelling of 639369181963936 in words is "six hundred thirty-nine trillion, three hundred sixty-nine billion, one hundred eighty-one million, nine hundred sixty-three thousand, nine hundred thirty-six".