18111718331 has 8 divisors (see below), whose sum is σ = 20703605760. Its totient is φ = 15520955688.

The previous prime is 18111718279. The next prime is 18111718351. The reversal of 18111718331 is 13381711181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-18111718331 is a prime.

It is a super-2 number, since 2×18111718331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18111718291 and 18111718300.

It is not an unprimeable number, because it can be changed into a prime (18111718351) 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, 246401 + ... + 311346.

It is an arithmetic number, because the mean of its divisors is an integer number (2587950720).

Almost surely, 2^18111718331 is an apocalyptic number.

18111718331 is a deficient number, since it is larger than the sum of its proper divisors (2591887429).

18111718331 is an equidigital number, since it uses as much as digits as its factorization.

18111718331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562393.

The product of its digits is 4032, while the sum is 35.

The spelling of 18111718331 in words is "eighteen billion, one hundred eleven million, seven hundred eighteen thousand, three hundred thirty-one".