266331223 has 2 divisors, whose sum is σ = 266331224. Its totient is φ = 266331222.

The previous prime is 266331193. The next prime is 266331257. The reversal of 266331223 is 322133662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266331223 - 2²¹ = 264234071 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 266331191 and 266331200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266331523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133165611 + 133165612.

It is an arithmetic number, because the mean of its divisors is an integer number (133165612).

Almost surely, 2^266331223 is an apocalyptic number.

266331223 is a deficient number, since it is larger than the sum of its proper divisors (1).

266331223 is an equidigital number, since it uses as much as digits as its factorization.

266331223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 28.

The square root of 266331223 is about 16319.6575638094. The cubic root of 266331223 is about 643.3895870760.

Adding to 266331223 its reverse (322133662), we get a palindrome (588464885).

The spelling of 266331223 in words is "two hundred sixty-six million, three hundred thirty-one thousand, two hundred twenty-three".