166986 has 12 divisors (see below), whose sum is σ = 361842. Its totient is φ = 55656.

The previous prime is 166979. The next prime is 166987. The reversal of 166986 is 689661.

It can be written as a sum of positive squares in only one way, i.e., 119025 + 47961 = 345^2 + 219^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166986.

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

166986 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 4621 + ... + 4656.

2¹⁶⁶⁹⁸⁶ is an apocalyptic number.

166986 is an abundant number, since it is smaller than the sum of its proper divisors (194856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166986 is a wasteful number, since it uses less digits than its factorization.

166986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9285 (or 9282 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 166986 is about 408.6392051676. The cubic root of 166986 is about 55.0672455726.

The spelling of 166986 in words is "one hundred sixty-six thousand, nine hundred eighty-six".