641962079711181 has 12 divisors (see below), whose sum is σ = 931126188463900. Its totient is φ = 426198891093120.

The previous prime is 641962079711177. The next prime is 641962079711189. The reversal of 641962079711181 is 181117970269146.

641962079711181 is a `hidden beast` number, since 6 + 419 + 6 + 2 + 0 + 79 + 71 + 1 + 1 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 454562270457156 + 187399809254025 = 21320466^2 + 13689405^2 .

It is not a de Polignac number, because 641962079711181 - 2² = 641962079711177 is a prime.

It is a super-2 number, since 2×641962079711181² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641962079711189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147985723906 + ... + 147985728243.

Almost surely, 2^{641962079711181} is an apocalyptic number.

It is an amenable number.

641962079711181 is a deficient number, since it is larger than the sum of its proper divisors (289164108752719).

641962079711181 is a wasteful number, since it uses less digits than its factorization.

641962079711181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295971452396 (or 295971452393 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 63.

The spelling of 641962079711181 in words is "six hundred forty-one trillion, nine hundred sixty-two billion, seventy-nine million, seven hundred eleven thousand, one hundred eighty-one".