166885 has 4 divisors (see below), whose sum is σ = 200268. Its totient is φ = 133504.

The previous prime is 166871. The next prime is 166909. The reversal of 166885 is 588661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588661 = 71 ⋅8291.

It can be written as a sum of positive squares in 2 ways, for example, as 91809 + 75076 = 303^2 + 274^2 .

It is a cyclic number.

It is not a de Polignac number, because 166885 - 2⁵ = 166853 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 166885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16684 + ... + 16693.

It is an arithmetic number, because the mean of its divisors is an integer number (50067).

2¹⁶⁶⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

166885 is a deficient number, since it is larger than the sum of its proper divisors (33383).

166885 is an equidigital number, since it uses as much as digits as its factorization.

166885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33382.

The product of its digits is 11520, while the sum is 34.

The square root of 166885 is about 408.5156055771. The cubic root of 166885 is about 55.0561410219.

The spelling of 166885 in words is "one hundred sixty-six thousand, eight hundred eighty-five".