166666684885 has 16 divisors (see below), whose sum is σ = 207025133040. Its totient is φ = 128655654400.

The previous prime is 166666684871. The next prime is 166666684907. The reversal of 166666684885 is 588486666661.

It can be written as a sum of positive squares in 8 ways, for example, as 10168907281 + 156497777604 = 100841^2 + 395598^2 .

It is not a de Polignac number, because 166666684885 - 2⁵ = 166666684853 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122416 + ... + 590185.

It is an arithmetic number, because the mean of its divisors is an integer number (12939070815).

Almost surely, 2^166666684885 is an apocalyptic number.

It is an amenable number.

166666684885 is a deficient number, since it is larger than the sum of its proper divisors (40358448155).

166666684885 is a wasteful number, since it uses less digits than its factorization.

166666684885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714248.

The product of its digits is 477757440, while the sum is 70.

The spelling of 166666684885 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred eighty-four thousand, eight hundred eighty-five".