266687 has 2 divisors, whose sum is σ = 266688. Its totient is φ = 266686.

The previous prime is 266683. The next prime is 266689. The reversal of 266687 is 786662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266687 - 2² = 266683 is a prime.

It is a super-2 number, since 2×266687² = 142243911938, which contains 22 as substring.

Together with 266689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133343 + 133344.

It is an arithmetic number, because the mean of its divisors is an integer number (133344).

2²⁶⁶⁶⁸⁷ is an apocalyptic number.

266687 is a deficient number, since it is larger than the sum of its proper divisors (1).

266687 is an equidigital number, since it uses as much as digits as its factorization.

266687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 266687 is about 516.4174667844. The cubic root of 266687 is about 64.3675949003.

The spelling of 266687 in words is "two hundred sixty-six thousand, six hundred eighty-seven".