195243113889 has 12 divisors (see below), whose sum is σ = 282040179876. Its totient is φ = 130151761152.

The previous prime is 195243113873. The next prime is 195243113899. The reversal of 195243113889 is 988311342591.

It is a happy number.

195243113889 is a `hidden beast` number, since 1 + 9 + 5 + 243 + 11 + 388 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 166476240225 + 28766873664 = 408015^2 + 169608^2 .

It is not a de Polignac number, because 195243113889 - 2⁴ = 195243113873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (195243113809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 738792 + ... + 967625.

It is an arithmetic number, because the mean of its divisors is an integer number (23503348323).

Almost surely, 2^195243113889 is an apocalyptic number.

It is an amenable number.

195243113889 is a deficient number, since it is larger than the sum of its proper divisors (86797065987).

195243113889 is a wasteful number, since it uses less digits than its factorization.

195243113889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719136 (or 1719133 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 195243113889 in words is "one hundred ninety-five billion, two hundred forty-three million, one hundred thirteen thousand, eight hundred eighty-nine".