266545 has 4 divisors (see below), whose sum is σ = 319860. Its totient is φ = 213232.

The previous prime is 266521. The next prime is 266549. The reversal of 266545 is 545662.

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 87616 + 178929 = 296^2 + 423^2 .

It is a cyclic number.

It is not a de Polignac number, because 266545 - 2⁷ = 266417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (266549) 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, 26650 + ... + 26659.

It is an arithmetic number, because the mean of its divisors is an integer number (79965).

2²⁶⁶⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

266545 is a deficient number, since it is larger than the sum of its proper divisors (53315).

266545 is an equidigital number, since it uses as much as digits as its factorization.

266545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53314.

The product of its digits is 7200, while the sum is 28.

The square root of 266545 is about 516.2799628109. The cubic root of 266545 is about 64.3561684950.

The spelling of 266545 in words is "two hundred sixty-six thousand, five hundred forty-five".