266872217 has 2 divisors, whose sum is σ = 266872218. Its totient is φ = 266872216.

The previous prime is 266872201. The next prime is 266872219. The reversal of 266872217 is 712278662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253796761 + 13075456 = 15931^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 266872217 - 2⁴ = 266872201 is a prime.

Together with 266872219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (266872219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133436108 + 133436109.

It is an arithmetic number, because the mean of its divisors is an integer number (133436109).

Almost surely, 2^266872217 is an apocalyptic number.

It is an amenable number.

266872217 is a deficient number, since it is larger than the sum of its proper divisors (1).

266872217 is an equidigital number, since it uses as much as digits as its factorization.

266872217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 41.

The square root of 266872217 is about 16336.2240741244. The cubic root of 266872217 is about 643.8249278168.

The spelling of 266872217 in words is "two hundred sixty-six million, eight hundred seventy-two thousand, two hundred seventeen".