18192729091 has 16 divisors (see below), whose sum is σ = 18838934208. Its totient is φ = 17560972800.

The previous prime is 18192729013. The next prime is 18192729101. The reversal of 18192729091 is 19092729181.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18192729091 - 2¹¹ = 18192727043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18192729791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 697261 + ... + 722881.

It is an arithmetic number, because the mean of its divisors is an integer number (1177433388).

Almost surely, 2^18192729091 is an apocalyptic number.

18192729091 is a deficient number, since it is larger than the sum of its proper divisors (646205117).

18192729091 is a wasteful number, since it uses less digits than its factorization.

18192729091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25902.

The product of its (nonzero) digits is 163296, while the sum is 49.

The spelling of 18192729091 in words is "eighteen billion, one hundred ninety-two million, seven hundred twenty-nine thousand, ninety-one".