166852509 has 16 divisors (see below), whose sum is σ = 241735680. Its totient is φ = 101980080.

The previous prime is 166852487. The next prime is 166852537. The reversal of 166852509 is 905258661.

It is not a de Polignac number, because 166852509 - 2⁷ = 166852381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166852559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45447 + ... + 48980.

It is an arithmetic number, because the mean of its divisors is an integer number (15108480).

Almost surely, 2^166852509 is an apocalyptic number.

166852509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

166852509 is a deficient number, since it is larger than the sum of its proper divisors (74883171).

166852509 is a wasteful number, since it uses less digits than its factorization.

166852509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94480.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 166852509 is about 12917.1401246561. The cubic root of 166852509 is about 550.5256781244.

The spelling of 166852509 in words is "one hundred sixty-six million, eight hundred fifty-two thousand, five hundred nine".