18218558111 has 12 divisors (see below), whose sum is σ = 19831109760. Its totient is φ = 16729053120.

The previous prime is 18218558081. The next prime is 18218558119. The reversal of 18218558111 is 11185581281.

It is not a de Polignac number, because 18218558111 - 2²² = 18214363807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218558119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249926 + ... + 314483.

It is an arithmetic number, because the mean of its divisors is an integer number (1652592480).

Almost surely, 2^18218558111 is an apocalyptic number.

18218558111 is a deficient number, since it is larger than the sum of its proper divisors (1612551649).

18218558111 is a wasteful number, since it uses less digits than its factorization.

18218558111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564626 (or 564613 counting only the distinct ones).

The product of its digits is 25600, while the sum is 41.

The spelling of 18218558111 in words is "eighteen billion, two hundred eighteen million, five hundred fifty-eight thousand, one hundred eleven".