641764465408 has 72 divisors (see below), whose sum is σ = 1445667688080. Its totient is φ = 281652080640.

The previous prime is 641764465369. The next prime is 641764465411. The reversal of 641764465408 is 804564467146.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3847635 + ... + 4010962.

It is an arithmetic number, because the mean of its divisors is an integer number (20078717890).

Almost surely, 2^641764465408 is an apocalyptic number.

It is an amenable number.

641764465408 is an abundant number, since it is smaller than the sum of its proper divisors (803903222672).

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

641764465408 is a wasteful number, since it uses less digits than its factorization.

641764465408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7858653 (or 7858639 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 55.

The spelling of 641764465408 in words is "six hundred forty-one billion, seven hundred sixty-four million, four hundred sixty-five thousand, four hundred eight".