266503791563 has 2 divisors, whose sum is σ = 266503791564. Its totient is φ = 266503791562.

The previous prime is 266503791553. The next prime is 266503791569. The reversal of 266503791563 is 365197305662.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266503791563 is a prime.

It is not a weakly prime, because it can be changed into another prime (266503791569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133251895781 + 133251895782.

It is an arithmetic number, because the mean of its divisors is an integer number (133251895782).

Almost surely, 2^266503791563 is an apocalyptic number.

266503791563 is a deficient number, since it is larger than the sum of its proper divisors (1).

266503791563 is an equidigital number, since it uses as much as digits as its factorization.

266503791563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6123600, while the sum is 53.

The spelling of 266503791563 in words is "two hundred sixty-six billion, five hundred three million, seven hundred ninety-one thousand, five hundred sixty-three".