181911091912 has 16 divisors (see below), whose sum is σ = 372090870000. Its totient is φ = 82686859920.

The previous prime is 181911091903. The next prime is 181911091913. The reversal of 181911091912 is 219190119181.

It is a super-2 number, since 2×181911091912² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181911091913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1033585662 + ... + 1033585837.

It is an arithmetic number, because the mean of its divisors is an integer number (23255679375).

Almost surely, 2^181911091912 is an apocalyptic number.

It is an amenable number.

181911091912 is an abundant number, since it is smaller than the sum of its proper divisors (190179778088).

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

181911091912 is a wasteful number, since it uses less digits than its factorization.

181911091912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067171516 (or 2067171512 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 43.

The spelling of 181911091912 in words is "one hundred eighty-one billion, nine hundred eleven million, ninety-one thousand, nine hundred twelve".