166566 has 32 divisors (see below), whose sum is σ = 373248. Its totient is φ = 49280.

The previous prime is 166561. The next prime is 166567. The reversal of 166566 is 665661.

166566 = T₈ + T₉ + ... + T₉₉.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 166566.

It is not an unprimeable number, because it can be changed into a prime (166561) by changing a digit.

166566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2311 + ... + 2381.

It is an arithmetic number, because the mean of its divisors is an integer number (11664).

2¹⁶⁶⁵⁶⁶ is an apocalyptic number.

166566 is an abundant number, since it is smaller than the sum of its proper divisors (206682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166566 is a wasteful number, since it uses less digits than its factorization.

166566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116.

The product of its digits is 6480, while the sum is 30.

The square root of 166566 is about 408.1249808576. The cubic root of 166566 is about 55.0210387831.

The spelling of 166566 in words is "one hundred sixty-six thousand, five hundred sixty-six".