166666685 has 16 divisors (see below), whose sum is σ = 206702976. Its totient is φ = 128910528.

The previous prime is 166666673. The next prime is 166666693. The reversal of 166666685 is 586666661.

It is a cyclic number.

It is not a de Polignac number, because 166666685 - 2¹⁴ = 166650301 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27392 + ... + 32918.

It is an arithmetic number, because the mean of its divisors is an integer number (12918936).

Almost surely, 2^166666685 is an apocalyptic number.

It is an amenable number.

166666685 is a deficient number, since it is larger than the sum of its proper divisors (40036291).

166666685 is a wasteful number, since it uses less digits than its factorization.

166666685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732.

The product of its digits is 1866240, while the sum is 50.

The square root of 166666685 is about 12909.9451974050. The cubic root of 166666685 is about 550.3212283275.

The spelling of 166666685 in words is "one hundred sixty-six million, six hundred sixty-six thousand, six hundred eighty-five".