128865195197 has 2 divisors, whose sum is σ = 128865195198. Its totient is φ = 128865195196.

The previous prime is 128865195191. The next prime is 128865195227. The reversal of 128865195197 is 791591568821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105816186436 + 23049008761 = 325294^2 + 151819^2 .

It is a cyclic number.

It is not a de Polignac number, because 128865195197 - 2²² = 128861000893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128865195191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64432597598 + 64432597599.

It is an arithmetic number, because the mean of its divisors is an integer number (64432597599).

Almost surely, 2^128865195197 is an apocalyptic number.

It is an amenable number.

128865195197 is a deficient number, since it is larger than the sum of its proper divisors (1).

128865195197 is an equidigital number, since it uses as much as digits as its factorization.

128865195197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10886400, while the sum is 62.

The spelling of 128865195197 in words is "one hundred twenty-eight billion, eight hundred sixty-five million, one hundred ninety-five thousand, one hundred ninety-seven".