266768563 has 2 divisors, whose sum is σ = 266768564. Its totient is φ = 266768562.

The previous prime is 266768519. The next prime is 266768611. The reversal of 266768563 is 365867662.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266768563 is a prime.

It is not a weakly prime, because it can be changed into another prime (266768963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133384281 + 133384282.

It is an arithmetic number, because the mean of its divisors is an integer number (133384282).

Almost surely, 2^266768563 is an apocalyptic number.

266768563 is a deficient number, since it is larger than the sum of its proper divisors (1).

266768563 is an equidigital number, since it uses as much as digits as its factorization.

266768563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 49.

The square root of 266768563 is about 16333.0512458634. The cubic root of 266768563 is about 643.7415624872.

Subtracting 266768563 from its reverse (365867662), we obtain a palindrome (99099099).

The spelling of 266768563 in words is "two hundred sixty-six million, seven hundred sixty-eight thousand, five hundred sixty-three".