18111491826 has 16 divisors (see below), whose sum is σ = 36295003584. Its totient is φ = 6025160624.

The previous prime is 18111491821. The next prime is 18111491831. The reversal of 18111491826 is 62819411181.

It is an interprime number because it is at equal distance from previous prime (18111491821) and next prime (18111491831).

It is a super-2 number, since 2×18111491826² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18111491821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2997561 + ... + 3003596.

It is an arithmetic number, because the mean of its divisors is an integer number (2268437724).

Almost surely, 2^18111491826 is an apocalyptic number.

18111491826 is an abundant number, since it is smaller than the sum of its proper divisors (18183511758).

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

18111491826 is a wasteful number, since it uses less digits than its factorization.

18111491826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6001665.

The product of its digits is 27648, while the sum is 42.

The spelling of 18111491826 in words is "eighteen billion, one hundred eleven million, four hundred ninety-one thousand, eight hundred twenty-six".