266545398461 has 2 divisors, whose sum is σ = 266545398462. Its totient is φ = 266545398460.

The previous prime is 266545398389. The next prime is 266545398463. The reversal of 266545398461 is 164893545662.

266545398461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246344461561 + 20200936900 = 496331^2 + 142130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266545398461 is a prime.

It is a super-2 number, since 2×266545398461² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 266545398463, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 266545398461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266545398463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133272699230 + 133272699231.

It is an arithmetic number, because the mean of its divisors is an integer number (133272699231).

Almost surely, 2^266545398461 is an apocalyptic number.

It is an amenable number.

266545398461 is a deficient number, since it is larger than the sum of its proper divisors (1).

266545398461 is an equidigital number, since it uses as much as digits as its factorization.

266545398461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37324800, while the sum is 59.

The spelling of 266545398461 in words is "two hundred sixty-six billion, five hundred forty-five million, three hundred ninety-eight thousand, four hundred sixty-one".