166709 has 4 divisors (see below), whose sum is σ = 170304. Its totient is φ = 163116.

The previous prime is 166703. The next prime is 166723. The reversal of 166709 is 907661.

It is a happy number.

166709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 907661 = 151 ⋅6011.

It is a cyclic number.

It is not a de Polignac number, because 166709 - 2⁴ = 166693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1727 + ... + 1820.

It is an arithmetic number, because the mean of its divisors is an integer number (42576).

2¹⁶⁶⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

166709 is a deficient number, since it is larger than the sum of its proper divisors (3595).

166709 is an equidigital number, since it uses as much as digits as its factorization.

166709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3594.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 166709 is about 408.3001347049. The cubic root of 166709 is about 55.0367798067.

The spelling of 166709 in words is "one hundred sixty-six thousand, seven hundred nine".