18500016816 has 160 divisors (see below), whose sum is σ = 54910771200. Its totient is φ = 5957314560.

The previous prime is 18500016809. The next prime is 18500016817. The reversal of 18500016816 is 61861000581.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18500016817) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 12440425 + ... + 12441911.

It is an arithmetic number, because the mean of its divisors is an integer number (343192320).

Almost surely, 2^18500016816 is an apocalyptic number.

18500016816 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 18500016816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27455385600).

18500016816 is an abundant number, since it is smaller than the sum of its proper divisors (36410754384).

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

18500016816 is a wasteful number, since it uses less digits than its factorization.

18500016816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464 (or 2452 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The spelling of 18500016816 in words is "eighteen billion, five hundred million, sixteen thousand, eight hundred sixteen".