266189439449 has 2 divisors, whose sum is σ = 266189439450. Its totient is φ = 266189439448.

The previous prime is 266189439431. The next prime is 266189439479. The reversal of 266189439449 is 944934981662.

266189439449 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., 235873406224 + 30316033225 = 485668^2 + 174115^2 .

It is a cyclic number.

It is not a de Polignac number, because 266189439449 - 2²⁴ = 266172662233 is a prime.

It is not a weakly prime, because it can be changed into another prime (266189439479) 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, 133094719724 + 133094719725.

It is an arithmetic number, because the mean of its divisors is an integer number (133094719725).

Almost surely, 2^266189439449 is an apocalyptic number.

It is an amenable number.

266189439449 is a deficient number, since it is larger than the sum of its proper divisors (1).

266189439449 is an equidigital number, since it uses as much as digits as its factorization.

266189439449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80621568, while the sum is 65.

The spelling of 266189439449 in words is "two hundred sixty-six billion, one hundred eighty-nine million, four hundred thirty-nine thousand, four hundred forty-nine".