18191929100913 has 6 divisors (see below), whose sum is σ = 26277230923554. Its totient is φ = 12127952733936.

The previous prime is 18191929100911. The next prime is 18191929100929. The reversal of 18191929100913 is 31900192919181.

18191929100913 is a `hidden beast` number, since 181 + 91 + 9 + 291 + 0 + 0 + 91 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12981155025969 + 5210774074944 = 3602937^2 + 2282712^2 .

It is not a de Polignac number, because 18191929100913 - 2¹ = 18191929100911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18191929100913.

It is not an unprimeable number, because it can be changed into a prime (18191929100911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1010662727820 + ... + 1010662727837.

It is an arithmetic number, because the mean of its divisors is an integer number (4379538487259).

Almost surely, 2^{18191929100913} is an apocalyptic number.

It is an amenable number.

18191929100913 is a deficient number, since it is larger than the sum of its proper divisors (8085301822641).

18191929100913 is a wasteful number, since it uses less digits than its factorization.

18191929100913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021325455663 (or 2021325455660 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 54.

The spelling of 18191929100913 in words is "eighteen trillion, one hundred ninety-one billion, nine hundred twenty-nine million, one hundred thousand, nine hundred thirteen".