166515165 has 24 divisors (see below), whose sum is σ = 291491928. Its totient is φ = 87926400.

The previous prime is 166515163. The next prime is 166515179. The reversal of 166515165 is 561515661.

It can be written as a sum of positive squares in 4 ways, for example, as 44235801 + 122279364 = 6651^2 + 11058^2 .

It is not a de Polignac number, because 166515165 - 2¹ = 166515163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166515163) 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 23 ways as a sum of consecutive naturals, for example, 13774 + ... + 22863.

It is an arithmetic number, because the mean of its divisors is an integer number (12145497).

Almost surely, 2^166515165 is an apocalyptic number.

166515165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166515165 is a deficient number, since it is larger than the sum of its proper divisors (124976763).

166515165 is a wasteful number, since it uses less digits than its factorization.

166515165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36749 (or 36746 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 166515165 is about 12904.0755189979. The cubic root of 166515165 is about 550.1544084375.

The spelling of 166515165 in words is "one hundred sixty-six million, five hundred fifteen thousand, one hundred sixty-five".