639955989559936 has 64 divisors (see below), whose sum is σ = 1458066580865280. Its totient is φ = 274074113645568.

The previous prime is 639955989559889. The next prime is 639955989560051.

639955989559936 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249686551 + ... + 252236566.

It is an arithmetic number, because the mean of its divisors is an integer number (22782290326020).

Almost surely, 2^{639955989559936} is an apocalyptic number.

It is an amenable number.

639955989559936 is an abundant number, since it is smaller than the sum of its proper divisors (818110591305344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639955989559936 is a wasteful number, since it uses less digits than its factorization.

639955989559936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501924561 (or 501924549 counting only the distinct ones).

The product of its digits is 860934420000, while the sum is 100.

The spelling of 639955989559936 in words is "six hundred thirty-nine trillion, nine hundred fifty-five billion, nine hundred eighty-nine million, five hundred fifty-nine thousand, nine hundred thirty-six".