266265217 has 2 divisors, whose sum is σ = 266265218. Its totient is φ = 266265216.

The previous prime is 266265173. The next prime is 266265247. The reversal of 266265217 is 712562662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266211856 + 53361 = 16316^2 + 231^2 .

It is a cyclic number.

It is not a de Polignac number, because 266265217 - 2¹⁹ = 265740929 is a prime.

It is not a weakly prime, because it can be changed into another prime (266265247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133132608 + 133132609.

It is an arithmetic number, because the mean of its divisors is an integer number (133132609).

Almost surely, 2^266265217 is an apocalyptic number.

It is an amenable number.

266265217 is a deficient number, since it is larger than the sum of its proper divisors (1).

266265217 is an equidigital number, since it uses as much as digits as its factorization.

266265217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 266265217 is about 16317.6351534161. The cubic root of 266265217 is about 643.3364313583.

The spelling of 266265217 in words is "two hundred sixty-six million, two hundred sixty-five thousand, two hundred seventeen".