166865 has 8 divisors (see below), whose sum is σ = 209088. Its totient is φ = 127600.

The previous prime is 166861. The next prime is 166867. The reversal of 166865 is 568661.

166865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166865 - 2² = 166861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611 + ... + 840.

It is an arithmetic number, because the mean of its divisors is an integer number (26136).

2¹⁶⁶⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

166865 is a deficient number, since it is larger than the sum of its proper divisors (42223).

166865 is a wasteful number, since it uses less digits than its factorization.

166865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479.

The product of its digits is 8640, while the sum is 32.

The square root of 166865 is about 408.4911259746. The cubic root of 166865 is about 55.0539415696.

It can be divided in two parts, 1 and 66865, that added together give a palindrome (66866).

The spelling of 166865 in words is "one hundred sixty-six thousand, eight hundred sixty-five".