166765 has 4 divisors (see below), whose sum is σ = 200124. Its totient is φ = 133408.

The previous prime is 166741. The next prime is 166781. The reversal of 166765 is 567661.

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 35721 + 131044 = 189^2 + 362^2 .

It is a cyclic number.

It is not a de Polignac number, because 166765 - 2¹³ = 158573 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16672 + ... + 16681.

It is an arithmetic number, because the mean of its divisors is an integer number (50031).

2¹⁶⁶⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

166765 is a deficient number, since it is larger than the sum of its proper divisors (33359).

166765 is an equidigital number, since it uses as much as digits as its factorization.

166765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33358.

The product of its digits is 7560, while the sum is 31.

The square root of 166765 is about 408.3687059509. The cubic root of 166765 is about 55.0429416708.

It can be divided in two parts, 1 and 66765, that added together give a palindrome (66766).

The spelling of 166765 in words is "one hundred sixty-six thousand, seven hundred sixty-five".