195377189789 has 2 divisors, whose sum is σ = 195377189790. Its totient is φ = 195377189788.

The previous prime is 195377189779. The next prime is 195377189797. The reversal of 195377189789 is 987981773591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168892231225 + 26484958564 = 410965^2 + 162742^2 .

It is an emirp because it is prime and its reverse (987981773591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195377189789 - 2⁸ = 195377189533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195377189779) 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, 97688594894 + 97688594895.

It is an arithmetic number, because the mean of its divisors is an integer number (97688594895).

Almost surely, 2^195377189789 is an apocalyptic number.

It is an amenable number.

195377189789 is a deficient number, since it is larger than the sum of its proper divisors (1).

195377189789 is an equidigital number, since it uses as much as digits as its factorization.

195377189789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240045120, while the sum is 74.

The spelling of 195377189789 in words is "one hundred ninety-five billion, three hundred seventy-seven million, one hundred eighty-nine thousand, seven hundred eighty-nine".