266464661 has 2 divisors, whose sum is σ = 266464662. Its totient is φ = 266464660.

The previous prime is 266464657. The next prime is 266464663. The reversal of 266464661 is 166464662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265494436 + 970225 = 16294^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 266464661 - 2² = 266464657 is a prime.

Together with 266464663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266464663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133232330 + 133232331.

It is an arithmetic number, because the mean of its divisors is an integer number (133232331).

Almost surely, 2^266464661 is an apocalyptic number.

It is an amenable number.

266464661 is a deficient number, since it is larger than the sum of its proper divisors (1).

266464661 is an equidigital number, since it uses as much as digits as its factorization.

266464661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 41.

The square root of 266464661 is about 16323.7453116618. The cubic root of 266464661 is about 643.4970200745.

Subtracting from 266464661 its reverse (166464662), we obtain a palindrome (99999999).

The spelling of 266464661 in words is "two hundred sixty-six million, four hundred sixty-four thousand, six hundred sixty-one".