266779349 has 2 divisors, whose sum is σ = 266779350. Its totient is φ = 266779348.

The previous prime is 266779343. The next prime is 266779393. The reversal of 266779349 is 943977662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243672100 + 23107249 = 15610^2 + 4807^2 .

It is a cyclic number.

It is not a de Polignac number, because 266779349 - 2¹⁶ = 266713813 is a prime.

It is a Sophie Germain 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 266779349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266779343) 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, 133389674 + 133389675.

It is an arithmetic number, because the mean of its divisors is an integer number (133389675).

Almost surely, 2^266779349 is an apocalyptic number.

It is an amenable number.

266779349 is a deficient number, since it is larger than the sum of its proper divisors (1).

266779349 is an equidigital number, since it uses as much as digits as its factorization.

266779349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 53.

The square root of 266779349 is about 16333.3814319020. The cubic root of 266779349 is about 643.7502383007.

The spelling of 266779349 in words is "two hundred sixty-six million, seven hundred seventy-nine thousand, three hundred forty-nine".