180159966 has 144 divisors (see below), whose sum is σ = 484009344. Its totient is φ = 48188448.

The previous prime is 180159953. The next prime is 180160009. The reversal of 180159966 is 669951081.

It is a super-2 number, since 2×180159966² = 64915226698242312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1683685 + ... + 1683791.

It is an arithmetic number, because the mean of its divisors is an integer number (3361176).

Almost surely, 2^180159966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 180159966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242004672).

180159966 is an abundant number, since it is smaller than the sum of its proper divisors (303849378).

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

180159966 is a wasteful number, since it uses less digits than its factorization.

180159966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 180159966 is about 13422.3681219075. The cubic root of 180159966 is about 564.7888275489.

The spelling of 180159966 in words is "one hundred eighty million, one hundred fifty-nine thousand, nine hundred sixty-six".