640811917202880 has 112 divisors (see below), whose sum is σ = 2034732939826464. Its totient is φ = 170870150922240.

The previous prime is 640811917202861. The next prime is 640811917202923. The reversal of 640811917202880 is 88202719118046.

It is a self number, because there is not a number n which added to its sum of digits gives 640811917202880.

It is a congruent number.

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, 12840637 + ... + 38032956.

Almost surely, 2^{640811917202880} is an apocalyptic number.

640811917202880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640811917202880 is an abundant number, since it is smaller than the sum of its proper divisors (1393921022623584).

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

640811917202880 is a wasteful number, since it uses less digits than its factorization.

640811917202880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50886734 (or 50886724 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 57.

The spelling of 640811917202880 in words is "six hundred forty trillion, eight hundred eleven billion, nine hundred seventeen million, two hundred two thousand, eight hundred eighty".