166685165 has 8 divisors (see below), whose sum is σ = 202432608. Its totient is φ = 131741200.

The previous prime is 166685143. The next prime is 166685177. The reversal of 166685165 is 561586661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166685165 - 2¹⁴ = 166668781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200411 + ... + 201240.

It is an arithmetic number, because the mean of its divisors is an integer number (25304076).

Almost surely, 2^166685165 is an apocalyptic number.

It is an amenable number.

166685165 is a deficient number, since it is larger than the sum of its proper divisors (35747443).

166685165 is an equidigital number, since it uses as much as digits as its factorization.

166685165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401739.

The product of its digits is 259200, while the sum is 44.

The square root of 166685165 is about 12910.6609048491. The cubic root of 166685165 is about 550.3415674462.

The spelling of 166685165 in words is "one hundred sixty-six million, six hundred eighty-five thousand, one hundred sixty-five".