266228813861 has 2 divisors, whose sum is σ = 266228813862. Its totient is φ = 266228813860.

The previous prime is 266228813821. The next prime is 266228813867. The reversal of 266228813861 is 168318822662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265085968225 + 1142845636 = 514865^2 + 33806^2 .

It is a cyclic number.

It is not a de Polignac number, because 266228813861 - 2¹⁴ = 266228797477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266228813867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133114406930 + 133114406931.

It is an arithmetic number, because the mean of its divisors is an integer number (133114406931).

Almost surely, 2^266228813861 is an apocalyptic number.

It is an amenable number.

266228813861 is a deficient number, since it is larger than the sum of its proper divisors (1).

266228813861 is an equidigital number, since it uses as much as digits as its factorization.

266228813861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 53.

The spelling of 266228813861 in words is "two hundred sixty-six billion, two hundred twenty-eight million, eight hundred thirteen thousand, eight hundred sixty-one".