195128395757 has 2 divisors, whose sum is σ = 195128395758. Its totient is φ = 195128395756.

The previous prime is 195128395729. The next prime is 195128395783. The reversal of 195128395757 is 757593821591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133098010276 + 62030385481 = 364826^2 + 249059^2 .

It is an emirp because it is prime and its reverse (757593821591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195128395757 - 2²² = 195124201453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195128395757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195128395727) 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, 97564197878 + 97564197879.

It is an arithmetic number, because the mean of its divisors is an integer number (97564197879).

Almost surely, 2^195128395757 is an apocalyptic number.

It is an amenable number.

195128395757 is a deficient number, since it is larger than the sum of its proper divisors (1).

195128395757 is an equidigital number, since it uses as much as digits as its factorization.

195128395757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814000, while the sum is 62.

The spelling of 195128395757 in words is "one hundred ninety-five billion, one hundred twenty-eight million, three hundred ninety-five thousand, seven hundred fifty-seven".