195196517909 has 4 divisors (see below), whose sum is σ = 195198370860. Its totient is φ = 195194664960.

The previous prime is 195196517899. The next prime is 195196517933. The reversal of 195196517909 is 909715691591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63783017809 + 131413500100 = 252553^2 + 362510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195196517909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195196510909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758282 + ... + 982539.

It is an arithmetic number, because the mean of its divisors is an integer number (48799592715).

Almost surely, 2^195196517909 is an apocalyptic number.

It is an amenable number.

195196517909 is a deficient number, since it is larger than the sum of its proper divisors (1852951).

195196517909 is a wasteful number, since it uses less digits than its factorization.

195196517909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852950.

The product of its (nonzero) digits is 6889050, while the sum is 62.

The spelling of 195196517909 in words is "one hundred ninety-five billion, one hundred ninety-six million, five hundred seventeen thousand, nine hundred nine".