166745 has 4 divisors (see below), whose sum is σ = 200100. Its totient is φ = 133392.

The previous prime is 166741. The next prime is 166781. The reversal of 166745 is 547661.

166745 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.

It can be written as a sum of positive squares in 2 ways, for example, as 121801 + 44944 = 349^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 166745 - 2² = 166741 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 166745.

It is not an unprimeable number, because it can be changed into a prime (166741) 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, 16670 + ... + 16679.

It is an arithmetic number, because the mean of its divisors is an integer number (50025).

2¹⁶⁶⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

166745 is a deficient number, since it is larger than the sum of its proper divisors (33355).

166745 is an equidigital number, since it uses as much as digits as its factorization.

166745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33354.

The product of its digits is 5040, while the sum is 29.

The square root of 166745 is about 408.3442175420. The cubic root of 166745 is about 55.0407411635.

The spelling of 166745 in words is "one hundred sixty-six thousand, seven hundred forty-five".