166442165 has 16 divisors (see below), whose sum is σ = 211664880. Its totient is φ = 125422080.

The previous prime is 166442161. The next prime is 166442167. The reversal of 166442165 is 561244661.

It can be written as a sum of positive squares in 8 ways, for example, as 908209 + 165533956 = 953^2 + 12866^2 .

It is not a de Polignac number, because 166442165 - 2² = 166442161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166442161) 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 15 ways as a sum of consecutive naturals, for example, 8054 + ... + 19943.

It is an arithmetic number, because the mean of its divisors is an integer number (13229055).

Almost surely, 2^166442165 is an apocalyptic number.

It is an amenable number.

166442165 is a deficient number, since it is larger than the sum of its proper divisors (45222715).

166442165 is a wasteful number, since it uses less digits than its factorization.

166442165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28072.

The product of its digits is 34560, while the sum is 35.

The square root of 166442165 is about 12901.2466451890. The cubic root of 166442165 is about 550.0740010622.

The spelling of 166442165 in words is "one hundred sixty-six million, four hundred forty-two thousand, one hundred sixty-five".