266647 has 2 divisors, whose sum is σ = 266648. Its totient is φ = 266646.

The previous prime is 266641. The next prime is 266663. The reversal of 266647 is 746662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266647 - 2¹¹ = 264599 is a prime.

It is a super-2 number, since 2×266647² = 142201245218, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133323 + 133324.

It is an arithmetic number, because the mean of its divisors is an integer number (133324).

2²⁶⁶⁶⁴⁷ is an apocalyptic number.

266647 is a deficient number, since it is larger than the sum of its proper divisors (1).

266647 is an equidigital number, since it uses as much as digits as its factorization.

266647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

The square root of 266647 is about 516.3787369751. The cubic root of 266647 is about 64.3643766050.

The spelling of 266647 in words is "two hundred sixty-six thousand, six hundred forty-seven".