166891085 has 8 divisors (see below), whose sum is σ = 207175320. Its totient is φ = 128908864.

The previous prime is 166891069. The next prime is 166891093. The reversal of 166891085 is 580198661.

It can be written as a sum of positive squares in 4 ways, for example, as 3613801 + 163277284 = 1901^2 + 12778^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166891085 - 2⁴ = 166891069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575342 + ... + 575631.

It is an arithmetic number, because the mean of its divisors is an integer number (25896915).

Almost surely, 2^166891085 is an apocalyptic number.

It is an amenable number.

166891085 is a deficient number, since it is larger than the sum of its proper divisors (40284235).

166891085 is a wasteful number, since it uses less digits than its factorization.

166891085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151007.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 166891085 is about 12918.6332481420. The cubic root of 166891085 is about 550.5681017040.

The spelling of 166891085 in words is "one hundred sixty-six million, eight hundred ninety-one thousand, eighty-five".