641015910820 has 12 divisors (see below), whose sum is σ = 1346133412764. Its totient is φ = 256406364320.

The previous prime is 641015910791. The next prime is 641015910827. The reversal of 641015910820 is 28019510146.

It can be written as a sum of positive squares in 2 ways, for example, as 454785686884 + 186230223936 = 674378^2 + 431544^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 641015910820.

It is not an unprimeable number, because it can be changed into a prime (641015910827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16025397751 + ... + 16025397790.

It is an arithmetic number, because the mean of its divisors is an integer number (112177784397).

Almost surely, 2^641015910820 is an apocalyptic number.

It is an amenable number.

641015910820 is an abundant number, since it is smaller than the sum of its proper divisors (705117501944).

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

641015910820 is a wasteful number, since it uses less digits than its factorization.

641015910820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32050795550 (or 32050795548 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 641015910820 in words is "six hundred forty-one billion, fifteen million, nine hundred ten thousand, eight hundred twenty".