266780349709 has 2 divisors, whose sum is σ = 266780349710. Its totient is φ = 266780349708.

The previous prime is 266780349707. The next prime is 266780349713. The reversal of 266780349709 is 907943087662.

266780349709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156798576484 + 109981773225 = 395978^2 + 331635^2 .

It is a cyclic number.

It is not a de Polignac number, because 266780349709 - 2¹ = 266780349707 is a prime.

Together with 266780349707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266780349707) 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, 133390174854 + 133390174855.

It is an arithmetic number, because the mean of its divisors is an integer number (133390174855).

Almost surely, 2^266780349709 is an apocalyptic number.

It is an amenable number.

266780349709 is a deficient number, since it is larger than the sum of its proper divisors (1).

266780349709 is an equidigital number, since it uses as much as digits as its factorization.

266780349709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27433728, while the sum is 61.

The spelling of 266780349709 in words is "two hundred sixty-six billion, seven hundred eighty million, three hundred forty-nine thousand, seven hundred nine".