195891639218 has 16 divisors (see below), whose sum is σ = 323490784320. Its totient is φ = 88224757200.

The previous prime is 195891639197. The next prime is 195891639221. The reversal of 195891639218 is 812936198591.

195891639218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 40842398 + ... + 40847193.

It is an arithmetic number, because the mean of its divisors is an integer number (20218174020).

Almost surely, 2^195891639218 is an apocalyptic number.

195891639218 is a deficient number, since it is larger than the sum of its proper divisors (127599145102).

195891639218 is a wasteful number, since it uses less digits than its factorization.

195891639218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81689713.

The product of its digits is 8398080, while the sum is 62.

The spelling of 195891639218 in words is "one hundred ninety-five billion, eight hundred ninety-one million, six hundred thirty-nine thousand, two hundred eighteen".