18191091092 has 12 divisors (see below), whose sum is σ = 33218514336. Its totient is φ = 8700087000.

The previous prime is 18191091071. The next prime is 18191091097. The reversal of 18191091092 is 29019019181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18191091097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98864534 + ... + 98864717.

It is an arithmetic number, because the mean of its divisors is an integer number (2768209528).

Almost surely, 2^18191091092 is an apocalyptic number.

It is an amenable number.

18191091092 is a deficient number, since it is larger than the sum of its proper divisors (15027423244).

18191091092 is a wasteful number, since it uses less digits than its factorization.

18191091092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197729278 (or 197729276 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 41.

The spelling of 18191091092 in words is "eighteen billion, one hundred ninety-one million, ninety-one thousand, ninety-two".