161616180 has 48 divisors (see below), whose sum is σ = 493665984. Its totient is φ = 39179520.

The previous prime is 161616179. The next prime is 161616181. The reversal of 161616180 is 81616161.

It is a happy number.

161616180 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161616179) and next prime (161616181).

It is a super-2 number, since 2×161616180² = 52239579275584800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161616181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121777 + ... + 123096.

It is an arithmetic number, because the mean of its divisors is an integer number (10284708).

Almost surely, 2^161616180 is an apocalyptic number.

161616180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161616180 is an abundant number, since it is smaller than the sum of its proper divisors (332049804).

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

161616180 is a wasteful number, since it uses less digits than its factorization.

161616180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244896 (or 244894 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 161616180 is about 12712.8352463170. The cubic root of 161616180 is about 544.7053144156.

The spelling of 161616180 in words is "one hundred sixty-one million, six hundred sixteen thousand, one hundred eighty".