266405263 has 2 divisors, whose sum is σ = 266405264. Its totient is φ = 266405262.

The previous prime is 266405257. The next prime is 266405299. The reversal of 266405263 is 362504662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266405263 - 2¹³ = 266397071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266405563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133202631 + 133202632.

It is an arithmetic number, because the mean of its divisors is an integer number (133202632).

Almost surely, 2^266405263 is an apocalyptic number.

266405263 is a deficient number, since it is larger than the sum of its proper divisors (1).

266405263 is an equidigital number, since it uses as much as digits as its factorization.

266405263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 266405263 is about 16321.9258361261. The cubic root of 266405263 is about 643.4492022560.

The spelling of 266405263 in words is "two hundred sixty-six million, four hundred five thousand, two hundred sixty-three".