18436144818 has 128 divisors (see below), whose sum is σ = 45868032000. Its totient is φ = 4810440960.

The previous prime is 18436144789. The next prime is 18436144849. The reversal of 18436144818 is 81844163481.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36945933 + ... + 36946431.

It is an arithmetic number, because the mean of its divisors is an integer number (358344000).

Almost surely, 2^18436144818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18436144818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22934016000).

18436144818 is an abundant number, since it is smaller than the sum of its proper divisors (27431887182).

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

18436144818 is a wasteful number, since it uses less digits than its factorization.

18436144818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112.

The product of its digits is 589824, while the sum is 48.

The spelling of 18436144818 in words is "eighteen billion, four hundred thirty-six million, one hundred forty-four thousand, eight hundred eighteen".