266646 has 16 divisors (see below), whose sum is σ = 561600. Its totient is φ = 84168.

The previous prime is 266641. The next prime is 266647. The reversal of 266646 is 646662.

It is a super-2 number, since 2×266646² = 142200178632, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 266646.

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 7 ways as a sum of consecutive naturals, for example, 1056 + ... + 1283.

It is an arithmetic number, because the mean of its divisors is an integer number (35100).

2²⁶⁶⁶⁴⁶ is an apocalyptic number.

266646 is an abundant number, since it is smaller than the sum of its proper divisors (294954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266646 is a wasteful number, since it uses less digits than its factorization.

266646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363.

The product of its digits is 10368, while the sum is 30.

The square root of 266646 is about 516.3777686927. The cubic root of 266646 is about 64.3642961435.

The spelling of 266646 in words is "two hundred sixty-six thousand, six hundred forty-six".