640814074185 has 16 divisors (see below), whose sum is σ = 1025330250816. Its totient is φ = 341758262208.

The previous prime is 640814074169. The next prime is 640814074207. The reversal of 640814074185 is 581470418046.

It is not a de Polignac number, because 640814074185 - 2⁴ = 640814074169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14922 + ... + 1132188.

It is an arithmetic number, because the mean of its divisors is an integer number (64083140676).

Almost surely, 2^640814074185 is an apocalyptic number.

It is an amenable number.

640814074185 is a deficient number, since it is larger than the sum of its proper divisors (384516176631).

640814074185 is a wasteful number, since it uses less digits than its factorization.

640814074185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155512.

The product of its (nonzero) digits is 860160, while the sum is 48.

The spelling of 640814074185 in words is "six hundred forty billion, eight hundred fourteen million, seventy-four thousand, one hundred eighty-five".