266239431013 has 2 divisors, whose sum is σ = 266239431014. Its totient is φ = 266239431012.

The previous prime is 266239431001. The next prime is 266239431041. The reversal of 266239431013 is 310134932662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262751583649 + 3487847364 = 512593^2 + 59058^2 .

It is a cyclic number.

It is not a de Polignac number, because 266239431013 - 2²¹ = 266237333861 is a prime.

It is a super-2 number, since 2×266239431013² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266239431053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133119715506 + 133119715507.

It is an arithmetic number, because the mean of its divisors is an integer number (133119715507).

Almost surely, 2^266239431013 is an apocalyptic number.

It is an amenable number.

266239431013 is a deficient number, since it is larger than the sum of its proper divisors (1).

266239431013 is an equidigital number, since it uses as much as digits as its factorization.

266239431013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 40.

The spelling of 266239431013 in words is "two hundred sixty-six billion, two hundred thirty-nine million, four hundred thirty-one thousand, thirteen".