11691257563 has 2 divisors, whose sum is σ = 11691257564. Its totient is φ = 11691257562.

The previous prime is 11691257531. The next prime is 11691257569. The reversal of 11691257563 is 36575219611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11691257563 - 2⁵ = 11691257531 is a prime.

It is not a weakly prime, because it can be changed into another prime (11691257569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5845628781 + 5845628782.

It is an arithmetic number, because the mean of its divisors is an integer number (5845628782).

Almost surely, 2^11691257563 is an apocalyptic number.

11691257563 is a deficient number, since it is larger than the sum of its proper divisors (1).

11691257563 is an equidigital number, since it uses as much as digits as its factorization.

11691257563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 46.

The spelling of 11691257563 in words is "eleven billion, six hundred ninety-one million, two hundred fifty-seven thousand, five hundred sixty-three".