641220965792 has 96 divisors (see below), whose sum is σ = 1398281149440. Its totient is φ = 286999130880.

The previous prime is 641220965789. The next prime is 641220965807. The reversal of 641220965792 is 297569022146.

It is a super-2 number, since 2×641220965792² (a number of 24 digits) contains 22 as substring.

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, 92139209 + ... + 92146167.

It is an arithmetic number, because the mean of its divisors is an integer number (14565428640).

Almost surely, 2^641220965792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641220965792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (699140574720).

641220965792 is an abundant number, since it is smaller than the sum of its proper divisors (757060183648).

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

641220965792 is a wasteful number, since it uses less digits than its factorization.

641220965792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10954 (or 10946 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 641220965792 in words is "six hundred forty-one billion, two hundred twenty million, nine hundred sixty-five thousand, seven hundred ninety-two".