166985959 has 8 divisors (see below), whose sum is σ = 191037600. Its totient is φ = 142983456.

The previous prime is 166985953. The next prime is 166985963. The reversal of 166985959 is 959589661.

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

It is not a de Polignac number, because 166985959 - 2⁹ = 166985447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166985953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4684 + ... + 18865.

It is an arithmetic number, because the mean of its divisors is an integer number (23879700).

Almost surely, 2^166985959 is an apocalyptic number.

166985959 is a deficient number, since it is larger than the sum of its proper divisors (24051641).

166985959 is a wasteful number, since it uses less digits than its factorization.

166985959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24569.

The product of its digits is 5248800, while the sum is 58.

The square root of 166985959 is about 12922.3047093001. The cubic root of 166985959 is about 550.6724106572.

The spelling of 166985959 in words is "one hundred sixty-six million, nine hundred eighty-five thousand, nine hundred fifty-nine".