180199981836 has 288 divisors, whose sum is σ = 541058918400. Its totient is φ = 49504089600.

The previous prime is 180199981831. The next prime is 180199981867. The reversal of 180199981836 is 638189991081.

180199981836 is a `hidden beast` number, since 180 + 199 + 98 + 183 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (180199981831) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 250625485 + ... + 250626203.

It is an arithmetic number, because the mean of its divisors is an integer number (1878676800).

Almost surely, 2^180199981836 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 180199981836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270529459200).

180199981836 is an abundant number, since it is smaller than the sum of its proper divisors (360858936564).

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

180199981836 is a wasteful number, since it uses less digits than its factorization.

180199981836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 63.

The spelling of 180199981836 in words is "one hundred eighty billion, one hundred ninety-nine million, nine hundred eighty-one thousand, eight hundred thirty-six".