18181698156 has 24 divisors (see below), whose sum is σ = 47137736240. Its totient is φ = 6060566016.

The previous prime is 18181698137. The next prime is 18181698163. The reversal of 18181698156 is 65189618181.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 84174421 + ... + 84174636.

Almost surely, 2^18181698156 is an apocalyptic number.

It is an amenable number.

18181698156 is an abundant number, since it is smaller than the sum of its proper divisors (28956038084).

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

18181698156 is a wasteful number, since it uses less digits than its factorization.

18181698156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168349070 (or 168349062 counting only the distinct ones).

The product of its digits is 829440, while the sum is 54.

It can be divided in two parts, 181816 and 98156, that added together give a palindrome (279972).

The spelling of 18181698156 in words is "eighteen billion, one hundred eighty-one million, six hundred ninety-eight thousand, one hundred fifty-six".