195253985891 has 4 divisors (see below), whose sum is σ = 195267165984. Its totient is φ = 195240805800.

The previous prime is 195253985873. The next prime is 195253985933. The reversal of 195253985891 is 198589352591.

195253985891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 195253985891 - 2¹⁸ = 195253723747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195253981891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6567800 + ... + 6597461.

It is an arithmetic number, because the mean of its divisors is an integer number (48816791496).

Almost surely, 2^195253985891 is an apocalyptic number.

195253985891 is a deficient number, since it is larger than the sum of its proper divisors (13180093).

195253985891 is a wasteful number, since it uses less digits than its factorization.

195253985891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13180092.

The product of its digits is 34992000, while the sum is 65.

The spelling of 195253985891 in words is "one hundred ninety-five billion, two hundred fifty-three million, nine hundred eighty-five thousand, eight hundred ninety-one".