18043137091 has 4 divisors (see below), whose sum is σ = 20620728112. Its totient is φ = 15465546072.

The previous prime is 18043137059. The next prime is 18043137103. The reversal of 18043137091 is 19073134081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18043137091 - 2⁵ = 18043137059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18043137091.

It is not an unprimeable number, because it can be changed into a prime (18043137191) 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, 1288795500 + ... + 1288795513.

It is an arithmetic number, because the mean of its divisors is an integer number (5155182028).

Almost surely, 2^18043137091 is an apocalyptic number.

18043137091 is a deficient number, since it is larger than the sum of its proper divisors (2577591021).

18043137091 is an equidigital number, since it uses as much as digits as its factorization.

18043137091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577591020.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 18043137091 in words is "eighteen billion, forty-three million, one hundred thirty-seven thousand, ninety-one".