195501959191 has 72 divisors (see below), whose sum is σ = 255317916672. Its totient is φ = 146439031200.

The previous prime is 195501959189. The next prime is 195501959231. The reversal of 195501959191 is 191959105591.

It is not a de Polignac number, because 195501959191 - 2¹ = 195501959189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195501959791) 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 71 ways as a sum of consecutive naturals, for example, 743353326 + ... + 743353588.

It is an arithmetic number, because the mean of its divisors is an integer number (3546082176).

Almost surely, 2^195501959191 is an apocalyptic number.

195501959191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

195501959191 is a deficient number, since it is larger than the sum of its proper divisors (59815957481).

195501959191 is an equidigital number, since it uses as much as digits as its factorization.

195501959191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 820125, while the sum is 55.

The spelling of 195501959191 in words is "one hundred ninety-five billion, five hundred one million, nine hundred fifty-nine thousand, one hundred ninety-one".