18011810091 has 16 divisors (see below), whose sum is σ = 26202117888. Its totient is φ = 10914948000.

The previous prime is 18011810083. The next prime is 18011810093. The reversal of 18011810091 is 19001811081.

It is not a de Polignac number, because 18011810091 - 2³ = 18011810083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18011810093) 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, 299170 + ... + 354296.

It is an arithmetic number, because the mean of its divisors is an integer number (1637632368).

Almost surely, 2^18011810091 is an apocalyptic number.

18011810091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18011810091 is a deficient number, since it is larger than the sum of its proper divisors (8190307797).

18011810091 is a wasteful number, since it uses less digits than its factorization.

18011810091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65042.

The product of its (nonzero) digits is 576, while the sum is 30.

The spelling of 18011810091 in words is "eighteen billion, eleven million, eight hundred ten thousand, ninety-one".