266564 has 12 divisors (see below), whose sum is σ = 471744. Its totient is φ = 131784.

The previous prime is 266549. The next prime is 266587. The reversal of 266564 is 465662.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89 + ... + 735.

It is an arithmetic number, because the mean of its divisors is an integer number (39312).

2²⁶⁶⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

266564 is a deficient number, since it is larger than the sum of its proper divisors (205180).

266564 is a wasteful number, since it uses less digits than its factorization.

266564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754 (or 752 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 266564 is about 516.2983633520. The cubic root of 266564 is about 64.3576976153.

It can be divided in two parts, 2 and 66564, that added together give a palindrome (66566).

The spelling of 266564 in words is "two hundred sixty-six thousand, five hundred sixty-four".