180199818216 has 144 divisors (see below), whose sum is σ = 541755903780. Its totient is φ = 54065088000.

The previous prime is 180199818181. The next prime is 180199818217. The reversal of 180199818216 is 612818991081.

It can be written as a sum of positive squares in 2 ways, for example, as 158440618116 + 21759200100 = 398046^2 + 147510^2 .

It is not an unprimeable number, because it can be changed into a prime (180199818217) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 777516 + ... + 982308.

Almost surely, 2^180199818216 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 180199818216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270877951890).

180199818216 is an abundant number, since it is smaller than the sum of its proper divisors (361556085564).

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

180199818216 is a wasteful number, since it uses less digits than its factorization.

180199818216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204928 (or 204910 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 54.

The spelling of 180199818216 in words is "one hundred eighty billion, one hundred ninety-nine million, eight hundred eighteen thousand, two hundred sixteen".