266643 has 24 divisors (see below), whose sum is σ = 432432. Its totient is φ = 157248.

The previous prime is 266641. The next prime is 266647. The reversal of 266643 is 346662.

It is not a de Polignac number, because 266643 - 2¹ = 266641 is a prime.

It is a d-powerful number, because it can be written as 2¹³ + 6³ + 6⁵ + 6⁵ + 4⁸ + 3¹¹ .

It is not an unprimeable number, because it can be changed into a prime (266641) 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 23 ways as a sum of consecutive naturals, for example, 5005 + ... + 5057.

It is an arithmetic number, because the mean of its divisors is an integer number (18018).

2²⁶⁶⁶⁴³ is an apocalyptic number.

266643 is a deficient number, since it is larger than the sum of its proper divisors (165789).

266643 is a wasteful number, since it uses less digits than its factorization.

266643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 112 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 266643 is about 516.3748638344. The cubic root of 266643 is about 64.3640547578.

It can be divided in two parts, 266 and 643, that added together give a palindrome (909).

The spelling of 266643 in words is "two hundred sixty-six thousand, six hundred forty-three".