641264402156 has 24 divisors (see below), whose sum is σ = 1283176984320. Its totient is φ = 274688705232.

The previous prime is 641264402143. The next prime is 641264402161. The reversal of 641264402156 is 651204462146.

It is a super-2 number, since 2×641264402156² (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 7 ways as a sum of consecutive naturals, for example, 5730920 + ... + 5841743.

It is an arithmetic number, because the mean of its divisors is an integer number (53465707680).

Almost surely, 2^641264402156 is an apocalyptic number.

It is an amenable number.

641264402156 is an abundant number, since it is smaller than the sum of its proper divisors (641912582164).

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

641264402156 is a wasteful number, since it uses less digits than its factorization.

641264402156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11574653 (or 11574651 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 641264402156 in words is "six hundred forty-one billion, two hundred sixty-four million, four hundred two thousand, one hundred fifty-six".