11718221663791 has 2 divisors, whose sum is σ = 11718221663792. Its totient is φ = 11718221663790.

The previous prime is 11718221663777. The next prime is 11718221663881. The reversal of 11718221663791 is 19736612281711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11718221663791 - 2²⁷ = 11718087446063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11718221663741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5859110831895 + 5859110831896.

It is an arithmetic number, because the mean of its divisors is an integer number (5859110831896).

Almost surely, 2^{11718221663791} is an apocalyptic number.

11718221663791 is a deficient number, since it is larger than the sum of its proper divisors (1).

11718221663791 is an equidigital number, since it uses as much as digits as its factorization.

11718221663791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 55.

The spelling of 11718221663791 in words is "eleven trillion, seven hundred eighteen billion, two hundred twenty-one million, six hundred sixty-three thousand, seven hundred ninety-one".