180171385156 has 27 divisors (see below), whose sum is σ = 366789560319. Its totient is φ = 77213761128.

The previous prime is 180171385151. The next prime is 180171385157. The reversal of 180171385156 is 651583171081.

The square root of 180171385156 is 424466.

It is a perfect power (a square), and thus also a powerful number.

It is not an unprimeable number, because it can be changed into a prime (180171385151) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 5927365 + ... + 5957683.

Almost surely, 2^180171385156 is an apocalyptic number.

180171385156 is the 424466-th square number.

It is an amenable number.

180171385156 is an abundant number, since it is smaller than the sum of its proper divisors (186618175163).

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

180171385156 is an frugal number, since it uses more digits than its factorization.

180171385156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60656 (or 30328 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 46.

The spelling of 180171385156 in words is "one hundred eighty billion, one hundred seventy-one million, three hundred eighty-five thousand, one hundred fifty-six".