18111436818 has 8 divisors (see below), whose sum is σ = 36222873648. Its totient is φ = 6037145604.

The previous prime is 18111436781. The next prime is 18111436867. The reversal of 18111436818 is 81863411181.

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

18111436818 is an admirable number.

It is a super-2 number, since 2×18111436818² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18111436818.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1509286396 + ... + 1509286407.

It is an arithmetic number, because the mean of its divisors is an integer number (4527859206).

Almost surely, 2^18111436818 is an apocalyptic number.

18111436818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18111436818 is a wasteful number, since it uses less digits than its factorization.

18111436818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018572808.

The product of its digits is 36864, while the sum is 42.

Adding to 18111436818 its reverse (81863411181), we get a palindrome (99974847999).

The spelling of 18111436818 in words is "eighteen billion, one hundred eleven million, four hundred thirty-six thousand, eight hundred eighteen".