180881216500 has 24 divisors (see below), whose sum is σ = 395044577928. Its totient is φ = 72352486400.

The previous prime is 180881216489. The next prime is 180881216591. The reversal of 180881216500 is 5612188081.

It can be written as a sum of positive squares in 4 ways, for example, as 18921653136 + 161959563364 = 137556^2 + 402442^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180880717 + ... + 180881716.

It is an arithmetic number, because the mean of its divisors is an integer number (16460190747).

Almost surely, 2^180881216500 is an apocalyptic number.

180881216500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180881216500 is an abundant number, since it is smaller than the sum of its proper divisors (214163361428).

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

180881216500 is a wasteful number, since it uses less digits than its factorization.

180881216500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361762452 (or 361762440 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 40.

The spelling of 180881216500 in words is "one hundred eighty billion, eight hundred eighty-one million, two hundred sixteen thousand, five hundred".