180991967772 has 72 divisors (see below), whose sum is σ = 535924287360. Its totient is φ = 47010899040.

The previous prime is 180991967759. The next prime is 180991967801. The reversal of 180991967772 is 277769199081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent 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, 13984872 + ... + 13997807.

It is an arithmetic number, because the mean of its divisors is an integer number (7443392880).

Almost surely, 2^180991967772 is an apocalyptic number.

180991967772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

180991967772 is an abundant number, since it is smaller than the sum of its proper divisors (354932319588).

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

180991967772 is a wasteful number, since it uses less digits than its factorization.

180991967772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27982711 (or 27982702 counting only the distinct ones).

The product of its (nonzero) digits is 24004512, while the sum is 66.

The spelling of 180991967772 in words is "one hundred eighty billion, nine hundred ninety-one million, nine hundred sixty-seven thousand, seven hundred seventy-two".