18401185218 has 16 divisors (see below), whose sum is σ = 39633322176. Its totient is φ = 5661903120.

The previous prime is 18401185207. The next prime is 18401185261. The reversal of 18401185218 is 81258110481.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117956238 + ... + 117956393.

It is an arithmetic number, because the mean of its divisors is an integer number (2477082636).

Almost surely, 2^18401185218 is an apocalyptic number.

18401185218 is an abundant number, since it is smaller than the sum of its proper divisors (21232136958).

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

18401185218 is a wasteful number, since it uses less digits than its factorization.

18401185218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235912649.

The product of its (nonzero) digits is 20480, while the sum is 39.

Adding to 18401185218 its reverse (81258110481), we get a palindrome (99659295699).

The spelling of 18401185218 in words is "eighteen billion, four hundred one million, one hundred eighty-five thousand, two hundred eighteen".