166556885 has 16 divisors (see below), whose sum is σ = 220803840. Its totient is φ = 119595840.

The previous prime is 166556879. The next prime is 166556891. The reversal of 166556885 is 588655661.

It is an interprime number because it is at equal distance from previous prime (166556879) and next prime (166556891).

It is not a de Polignac number, because 166556885 - 2⁶ = 166556821 is a prime.

It is a Curzon 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, 14822 + ... + 23511.

It is an arithmetic number, because the mean of its divisors is an integer number (13800240).

Almost surely, 2^166556885 is an apocalyptic number.

It is an amenable number.

166556885 is a deficient number, since it is larger than the sum of its proper divisors (54246955).

166556885 is a wasteful number, since it uses less digits than its factorization.

166556885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38428.

The product of its digits is 1728000, while the sum is 50.

The square root of 166556885 is about 12905.6919613014. The cubic root of 166556885 is about 550.2003512506.

The spelling of 166556885 in words is "one hundred sixty-six million, five hundred fifty-six thousand, eight hundred eighty-five".