641251200220 has 12 divisors (see below), whose sum is σ = 1346627520504. Its totient is φ = 256500480080.

The previous prime is 641251200167. The next prime is 641251200251. The reversal of 641251200220 is 22002152146.

641251200220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641251200220² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 16031279986 + ... + 16031280025.

It is an arithmetic number, because the mean of its divisors is an integer number (112218960042).

Almost surely, 2^641251200220 is an apocalyptic number.

It is an amenable number.

641251200220 is an abundant number, since it is smaller than the sum of its proper divisors (705376320284).

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

641251200220 is a wasteful number, since it uses less digits than its factorization.

641251200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32062560020 (or 32062560018 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 641251200220 its reverse (22002152146), we get a palindrome (663253352366).

The spelling of 641251200220 in words is "six hundred forty-one billion, two hundred fifty-one million, two hundred thousand, two hundred twenty".