18191929100912 has 40 divisors (see below), whose sum is σ = 41139195303936. Its totient is φ = 7630657189056.

The previous prime is 18191929100911. The next prime is 18191929100929. The reversal of 18191929100912 is 21900192919181.

It is a super-3 number, since 3×18191929100912³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1727951528 + ... + 1727962055.

Almost surely, 2^{18191929100912} is an apocalyptic number.

It is an amenable number.

18191929100912 is an abundant number, since it is smaller than the sum of its proper divisors (22947266203024).

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

18191929100912 is a wasteful number, since it uses less digits than its factorization.

18191929100912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3455913645 (or 3455913639 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 53.

The spelling of 18191929100912 in words is "eighteen trillion, one hundred ninety-one billion, nine hundred twenty-nine million, one hundred thousand, nine hundred twelve".