641275778900 has 18 divisors (see below), whose sum is σ = 1391568440430. Its totient is φ = 256510311520.

The previous prime is 641275778893. The next prime is 641275778951. The reversal of 641275778900 is 9877572146.

641275778900 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 3 ways, for example, as 204634997956 + 436640780944 = 452366^2 + 660788^2 .

It is a super-2 number, since 2×641275778900² (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 5 ways as a sum of consecutive naturals, for example, 3206378795 + ... + 3206378994.

Almost surely, 2^641275778900 is an apocalyptic number.

It is an amenable number.

641275778900 is an abundant number, since it is smaller than the sum of its proper divisors (750292661530).

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

641275778900 is a wasteful number, since it uses less digits than its factorization.

641275778900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412757803 (or 6412757796 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 56.

The spelling of 641275778900 in words is "six hundred forty-one billion, two hundred seventy-five million, seven hundred seventy-eight thousand, nine hundred".