266189439349 has 4 divisors (see below), whose sum is σ = 267568659436. Its totient is φ = 264810219264.

The previous prime is 266189439331. The next prime is 266189439403. The reversal of 266189439349 is 943934981662.

266189439349 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 156830256324 + 109359183025 = 396018^2 + 330695^2 .

It is a cyclic number.

It is not a de Polignac number, because 266189439349 - 2⁷ = 266189439221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266189439449) 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 in 3 ways as a sum of consecutive naturals, for example, 689609754 + ... + 689610139.

It is an arithmetic number, because the mean of its divisors is an integer number (66892164859).

Almost surely, 2^266189439349 is an apocalyptic number.

It is an amenable number.

266189439349 is a deficient number, since it is larger than the sum of its proper divisors (1379220087).

266189439349 is a wasteful number, since it uses less digits than its factorization.

266189439349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379220086.

The product of its digits is 60466176, while the sum is 64.

The spelling of 266189439349 in words is "two hundred sixty-six billion, one hundred eighty-nine million, four hundred thirty-nine thousand, three hundred forty-nine".