640508577844 has 12 divisors (see below), whose sum is σ = 1121160852000. Its totient is φ = 320176905848.

The previous prime is 640508577833. The next prime is 640508577853. The reversal of 640508577844 is 448775805046.

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, 19327144 + ... + 19360255.

It is an arithmetic number, because the mean of its divisors is an integer number (93430071000).

Almost surely, 2^640508577844 is an apocalyptic number.

It is an amenable number.

640508577844 is a deficient number, since it is larger than the sum of its proper divisors (480652274156).

640508577844 is a wasteful number, since it uses less digits than its factorization.

640508577844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38691542 (or 38691540 counting only the distinct ones).

The product of its (nonzero) digits is 30105600, while the sum is 58.

The spelling of 640508577844 in words is "six hundred forty billion, five hundred eight million, five hundred seventy-seven thousand, eight hundred forty-four".