128865195191 has 2 divisors, whose sum is σ = 128865195192. Its totient is φ = 128865195190.

The previous prime is 128865195157. The next prime is 128865195197. The reversal of 128865195191 is 191591568821.

It is a strong prime.

It is an emirp because it is prime and its reverse (191591568821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128865195191 - 2²² = 128861000887 is a prime.

It is a super-2 number, since 2×128865195191² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128865195197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64432597595 + 64432597596.

It is an arithmetic number, because the mean of its divisors is an integer number (64432597596).

Almost surely, 2^128865195191 is an apocalyptic number.

128865195191 is a deficient number, since it is larger than the sum of its proper divisors (1).

128865195191 is an equidigital number, since it uses as much as digits as its factorization.

128865195191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 56.

The spelling of 128865195191 in words is "one hundred twenty-eight billion, eight hundred sixty-five million, one hundred ninety-five thousand, one hundred ninety-one".