180166165 has 4 divisors (see below), whose sum is σ = 216199404. Its totient is φ = 144132928.

The previous prime is 180166163. The next prime is 180166169. The reversal of 180166165 is 561661081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128527569 + 51638596 = 11337^2 + 7186^2 .

It is a cyclic number.

It is not a de Polignac number, because 180166165 - 2¹ = 180166163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 180166165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180166163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18016612 + ... + 18016621.

It is an arithmetic number, because the mean of its divisors is an integer number (54049851).

Almost surely, 2^180166165 is an apocalyptic number.

It is an amenable number.

180166165 is a deficient number, since it is larger than the sum of its proper divisors (36033239).

180166165 is an equidigital number, since it uses as much as digits as its factorization.

180166165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36033238.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 180166165 is about 13422.5990404243. The cubic root of 180166165 is about 564.7953052844.

The spelling of 180166165 in words is "one hundred eighty million, one hundred sixty-six thousand, one hundred sixty-five".