166589 has 4 divisors (see below), whose sum is σ = 173856. Its totient is φ = 159324.

The previous prime is 166571. The next prime is 166597. The reversal of 166589 is 985661.

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: 985661 = 163 ⋅6047.

It is a cyclic number.

It is not a de Polignac number, because 166589 - 2¹² = 162493 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166189) 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, 3599 + ... + 3644.

It is an arithmetic number, because the mean of its divisors is an integer number (43464).

2¹⁶⁶⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

166589 is a deficient number, since it is larger than the sum of its proper divisors (7267).

166589 is an equidigital number, since it uses as much as digits as its factorization.

166589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7266.

The product of its digits is 12960, while the sum is 35.

The square root of 166589 is about 408.1531575279. The cubic root of 166589 is about 55.0235711640.

The spelling of 166589 in words is "one hundred sixty-six thousand, five hundred eighty-nine".