266506740503 has 2 divisors, whose sum is σ = 266506740504. Its totient is φ = 266506740502.

The previous prime is 266506740481. The next prime is 266506740553. The reversal of 266506740503 is 305047605662.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266506740503 - 2¹⁴ = 266506724119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266506740553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133253370251 + 133253370252.

It is an arithmetic number, because the mean of its divisors is an integer number (133253370252).

Almost surely, 2^266506740503 is an apocalyptic number.

266506740503 is a deficient number, since it is larger than the sum of its proper divisors (1).

266506740503 is an equidigital number, since it uses as much as digits as its factorization.

266506740503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 266506740503 in words is "two hundred sixty-six billion, five hundred six million, seven hundred forty thousand, five hundred three".