63911171472191 has 2 divisors, whose sum is σ = 63911171472192. Its totient is φ = 63911171472190.

The previous prime is 63911171472151. The next prime is 63911171472199. The reversal of 63911171472191 is 19127417111936.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63911171472191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63911171472199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31955585736095 + 31955585736096.

It is an arithmetic number, because the mean of its divisors is an integer number (31955585736096).

Almost surely, 2^{63911171472191} is an apocalyptic number.

63911171472191 is a deficient number, since it is larger than the sum of its proper divisors (1).

63911171472191 is an equidigital number, since it uses as much as digits as its factorization.

63911171472191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 53.

The spelling of 63911171472191 in words is "sixty-three trillion, nine hundred eleven billion, one hundred seventy-one million, four hundred seventy-two thousand, one hundred ninety-one".