161215180 has 24 divisors (see below), whose sum is σ = 386916768. Its totient is φ = 55273728.

The previous prime is 161215177. The next prime is 161215181. The reversal of 161215180 is 81512161.

It is a happy number.

161215180 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161215181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575629 + ... + 575908.

It is an arithmetic number, because the mean of its divisors is an integer number (16121532).

Almost surely, 2^161215180 is an apocalyptic number.

161215180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161215180 is an abundant number, since it is smaller than the sum of its proper divisors (225701588).

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

161215180 is a wasteful number, since it uses less digits than its factorization.

161215180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151553 (or 1151551 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 161215180 is about 12697.0539890165. The cubic root of 161215180 is about 544.2544360173.

The spelling of 161215180 in words is "one hundred sixty-one million, two hundred fifteen thousand, one hundred eighty".