128663447591191 has 2 divisors, whose sum is σ = 128663447591192. Its totient is φ = 128663447591190.

The previous prime is 128663447591083. The next prime is 128663447591213. The reversal of 128663447591191 is 191195744366821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128663447591191 - 2⁹ = 128663447590679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128663447561191) 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, 64331723795595 + 64331723795596.

It is an arithmetic number, because the mean of its divisors is an integer number (64331723795596).

Almost surely, 2^{128663447591191} is an apocalyptic number.

128663447591191 is a deficient number, since it is larger than the sum of its proper divisors (1).

128663447591191 is an equidigital number, since it uses as much as digits as its factorization.

128663447591191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 67.

The spelling of 128663447591191 in words is "one hundred twenty-eight trillion, six hundred sixty-three billion, four hundred forty-seven million, five hundred ninety-one thousand, one hundred ninety-one".