18017328816 has 120 divisors (see below), whose sum is σ = 53232270000. Its totient is φ = 5673079296.

The previous prime is 18017328803. The next prime is 18017328827. The reversal of 18017328816 is 61882371081.

It is a happy number.

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 23 ways as a sum of consecutive naturals, for example, 945430 + ... + 964298.

It is an arithmetic number, because the mean of its divisors is an integer number (443602250).

Almost surely, 2^18017328816 is an apocalyptic number.

18017328816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18017328816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26616135000).

18017328816 is an abundant number, since it is smaller than the sum of its proper divisors (35214941184).

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

18017328816 is a wasteful number, since it uses less digits than its factorization.

18017328816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19251 (or 19242 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

Adding to 18017328816 its reverse (61882371081), we get a palindrome (79899699897).

The spelling of 18017328816 in words is "eighteen billion, seventeen million, three hundred twenty-eight thousand, eight hundred sixteen".