18000198216 has 512 divisors, whose sum is σ = 68544000000. Its totient is φ = 4313191680.

The previous prime is 18000198211. The next prime is 18000198257. The reversal of 18000198216 is 61289100081.

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 (18000198211) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10593735 + ... + 10595433.

It is an arithmetic number, because the mean of its divisors is an integer number (133875000).

Almost surely, 2^18000198216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18000198216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34272000000).

18000198216 is an abundant number, since it is smaller than the sum of its proper divisors (50543801784).

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

18000198216 is a wasteful number, since it uses less digits than its factorization.

18000198216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759 (or 1735 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

Adding to 18000198216 its reverse (61289100081), we get a palindrome (79289298297).

The spelling of 18000198216 in words is "eighteen billion, one hundred ninety-eight thousand, two hundred sixteen".