641333968256 has 16 divisors (see below), whose sum is σ = 1277657515140. Its totient is φ = 320666984064.

The previous prime is 641333968211. The next prime is 641333968291. The reversal of 641333968256 is 652869333146.

It is a happy number.

641333968256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×641333968256² (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 as a sum of consecutive naturals, namely, 2505210686 + ... + 2505210941.

Almost surely, 2^641333968256 is an apocalyptic number.

It is an amenable number.

641333968256 is a deficient number, since it is larger than the sum of its proper divisors (636323546884).

641333968256 is an equidigital number, since it uses as much as digits as its factorization.

641333968256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010421641 (or 5010421629 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 56.

The spelling of 641333968256 in words is "six hundred forty-one billion, three hundred thirty-three million, nine hundred sixty-eight thousand, two hundred fifty-six".