641946802168 has 32 divisors (see below), whose sum is σ = 1388456380800. Its totient is φ = 272548840032.

The previous prime is 641946802163. The next prime is 641946802169. The reversal of 641946802168 is 861208649146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641946802163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53560998 + ... + 53572981.

It is an arithmetic number, because the mean of its divisors is an integer number (43389261900).

Almost surely, 2^641946802168 is an apocalyptic number.

It is an amenable number.

641946802168 is an abundant number, since it is smaller than the sum of its proper divisors (746509578632).

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

641946802168 is a wasteful number, since it uses less digits than its factorization.

641946802168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107134099 (or 107134095 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 641946802168 in words is "six hundred forty-one billion, nine hundred forty-six million, eight hundred two thousand, one hundred sixty-eight".