640253002868 has 12 divisors (see below), whose sum is σ = 1130914183392. Its totient is φ = 317134664760.

The previous prime is 640253002847. The next prime is 640253002891. The reversal of 640253002868 is 868200352046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747958688 + ... + 747959543.

It is an arithmetic number, because the mean of its divisors is an integer number (94242848616).

Almost surely, 2^640253002868 is an apocalyptic number.

It is an amenable number.

640253002868 is a deficient number, since it is larger than the sum of its proper divisors (490661180524).

640253002868 is a wasteful number, since it uses less digits than its factorization.

640253002868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495918342 (or 1495918340 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 640253002868 in words is "six hundred forty billion, two hundred fifty-three million, two thousand, eight hundred sixty-eight".