641801563220 has 48 divisors (see below), whose sum is σ = 1351914233040. Its totient is φ = 255934119936.

The previous prime is 641801563213. The next prime is 641801563229. The reversal of 641801563220 is 22365108146.

641801563220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 40947141316 + 600854421904 = 202354^2 + 775148^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641801563229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42867896 + ... + 42882864.

It is an arithmetic number, because the mean of its divisors is an integer number (28164879855).

Almost surely, 2^641801563220 is an apocalyptic number.

It is an amenable number.

641801563220 is an abundant number, since it is smaller than the sum of its proper divisors (710112669820).

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

641801563220 is a wasteful number, since it uses less digits than its factorization.

641801563220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21404 (or 21402 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

It can be divided in two parts, 641801 and 563220, that added together give a palindrome (1205021).

The spelling of 641801563220 in words is "six hundred forty-one billion, eight hundred one million, five hundred sixty-three thousand, two hundred twenty".