266868761 has 2 divisors, whose sum is σ = 266868762. Its totient is φ = 266868760.

The previous prime is 266868731. The next prime is 266868779. The reversal of 266868761 is 167868662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163968025 + 102900736 = 12805^2 + 10144^2 .

It is a cyclic number.

It is not a de Polignac number, because 266868761 - 2²² = 262674457 is a prime.

It is not a weakly prime, because it can be changed into another prime (266868731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133434380 + 133434381.

It is an arithmetic number, because the mean of its divisors is an integer number (133434381).

Almost surely, 2^266868761 is an apocalyptic number.

It is an amenable number.

266868761 is a deficient number, since it is larger than the sum of its proper divisors (1).

266868761 is an equidigital number, since it uses as much as digits as its factorization.

266868761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 50.

The square root of 266868761 is about 16336.1182965844. The cubic root of 266868761 is about 643.8221486233.

Subtracting from 266868761 its reverse (167868662), we obtain a palindrome (99000099).

The spelling of 266868761 in words is "two hundred sixty-six million, eight hundred sixty-eight thousand, seven hundred sixty-one".