266686 has 16 divisors (see below), whose sum is σ = 468864. Its totient is φ = 111384.

The previous prime is 266683. The next prime is 266687. The reversal of 266686 is 686662.

It is a super-2 number, since 2×266686² = 142242845192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381 + ... + 823.

It is an arithmetic number, because the mean of its divisors is an integer number (29304).

2²⁶⁶⁶⁸⁶ is an apocalyptic number.

266686 is a deficient number, since it is larger than the sum of its proper divisors (202178).

266686 is a wasteful number, since it uses less digits than its factorization.

266686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495.

The product of its digits is 20736, while the sum is 34.

The square root of 266686 is about 516.4164985746. The cubic root of 266686 is about 64.3675144468.

The spelling of 266686 in words is "two hundred sixty-six thousand, six hundred eighty-six".