195563917919 has 4 divisors (see below), whose sum is σ = 195643192344. Its totient is φ = 195484643496.

The previous prime is 195563917907. The next prime is 195563917921. The reversal of 195563917919 is 919719365591.

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

It is a cyclic number.

It is not a de Polignac number, because 195563917919 - 2³⁶ = 126844441183 is a prime.

It is a super-2 number, since 2×195563917919² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195563917979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39633512 + ... + 39638445.

It is an arithmetic number, because the mean of its divisors is an integer number (48910798086).

Almost surely, 2^195563917919 is an apocalyptic number.

195563917919 is a deficient number, since it is larger than the sum of its proper divisors (79274425).

195563917919 is an equidigital number, since it uses as much as digits as its factorization.

195563917919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79274424.

The product of its digits is 20667150, while the sum is 65.

The spelling of 195563917919 in words is "one hundred ninety-five billion, five hundred sixty-three million, nine hundred seventeen thousand, nine hundred nineteen".