266081 has 2 divisors, whose sum is σ = 266082. Its totient is φ = 266080.

The previous prime is 266059. The next prime is 266083. The reversal of 266081 is 180662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173056 + 93025 = 416^2 + 305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266081 is a prime.

It is a super-2 number, since 2×266081² = 141598197122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 266083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 266081.

It is not a weakly prime, because it can be changed into another prime (266083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133040 + 133041.

It is an arithmetic number, because the mean of its divisors is an integer number (133041).

2²⁶⁶⁰⁸¹ is an apocalyptic number.

It is an amenable number.

266081 is a deficient number, since it is larger than the sum of its proper divisors (1).

266081 is an equidigital number, since it uses as much as digits as its factorization.

266081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 266081 is about 515.8303984838. The cubic root of 266081 is about 64.3188031891.

The spelling of 266081 in words is "two hundred sixty-six thousand, eighty-one".