640891441175 has 12 divisors (see below), whose sum is σ = 794810561160. Its totient is φ = 512645298720.

The previous prime is 640891441171. The next prime is 640891441193. The reversal of 640891441175 is 571144198046.

It is not a de Polignac number, because 640891441175 - 2² = 640891441171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640891441171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1503245 + ... + 1881894.

It is an arithmetic number, because the mean of its divisors is an integer number (66234213430).

Almost surely, 2^640891441175 is an apocalyptic number.

640891441175 is a deficient number, since it is larger than the sum of its proper divisors (153919119985).

640891441175 is a wasteful number, since it uses less digits than its factorization.

640891441175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392722 (or 3392717 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 640891441175 in words is "six hundred forty billion, eight hundred ninety-one million, four hundred forty-one thousand, one hundred seventy-five".