641905909388 has 12 divisors (see below), whose sum is σ = 1123684551192. Its totient is φ = 320853180480.

The previous prime is 641905909361. The next prime is 641905909417. The reversal of 641905909388 is 883909509146.

641905909388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 641905909388.

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, 24929078 + ... + 24954813.

It is an arithmetic number, because the mean of its divisors is an integer number (93640379266).

Almost surely, 2^641905909388 is an apocalyptic number.

It is an amenable number.

641905909388 is a deficient number, since it is larger than the sum of its proper divisors (481778641804).

641905909388 is a wasteful number, since it uses less digits than its factorization.

641905909388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49887112 (or 49887110 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 62.

The spelling of 641905909388 in words is "six hundred forty-one billion, nine hundred five million, nine hundred nine thousand, three hundred eighty-eight".