166985 has 16 divisors (see below), whose sum is σ = 247296. Its totient is φ = 105408.

The previous prime is 166979. The next prime is 166987. The reversal of 166985 is 589661.

It is a cyclic number.

It is not a de Polignac number, because 166985 - 2¹⁰ = 165961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (166987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272 + ... + 638.

It is an arithmetic number, because the mean of its divisors is an integer number (15456).

2¹⁶⁶⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

166985 is a deficient number, since it is larger than the sum of its proper divisors (80311).

166985 is a wasteful number, since it uses less digits than its factorization.

166985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392.

The product of its digits is 12960, while the sum is 35.

The square root of 166985 is about 408.6379815925. The cubic root of 166985 is about 55.0671356485.

The spelling of 166985 in words is "one hundred sixty-six thousand, nine hundred eighty-five".