266540269 has 2 divisors, whose sum is σ = 266540270. Its totient is φ = 266540268.

The previous prime is 266540249. The next prime is 266540299. The reversal of 266540269 is 962045662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255584169 + 10956100 = 15987^2 + 3310^2 .

It is a cyclic number.

It is not a de Polignac number, because 266540269 - 2⁵ = 266540237 is a prime.

It is a super-2 number, since 2×266540269² = 142087429997184722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266540249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133270134 + 133270135.

It is an arithmetic number, because the mean of its divisors is an integer number (133270135).

Almost surely, 2^266540269 is an apocalyptic number.

It is an amenable number.

266540269 is a deficient number, since it is larger than the sum of its proper divisors (1).

266540269 is an equidigital number, since it uses as much as digits as its factorization.

266540269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 266540269 is about 16326.0610374946. The cubic root of 266540269 is about 643.5578773273.

The spelling of 266540269 in words is "two hundred sixty-six million, five hundred forty thousand, two hundred sixty-nine".