266865 has 8 divisors (see below), whose sum is σ = 427008. Its totient is φ = 142320.

The previous prime is 266863. The next prime is 266867. The reversal of 266865 is 568662.

It is an interprime number because it is at equal distance from previous prime (266863) and next prime (266867).

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

It is not a de Polignac number, because 266865 - 2¹ = 266863 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (266863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8881 + ... + 8910.

It is an arithmetic number, because the mean of its divisors is an integer number (53376).

2²⁶⁶⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

266865 is a deficient number, since it is larger than the sum of its proper divisors (160143).

266865 is a wasteful number, since it uses less digits than its factorization.

266865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17799.

The product of its digits is 17280, while the sum is 33.

The square root of 266865 is about 516.5897792253. The cubic root of 266865 is about 64.3819124132.

The spelling of 266865 in words is "two hundred sixty-six thousand, eight hundred sixty-five".