195891639215 has 16 divisors (see below), whose sum is σ = 235972053408. Its totient is φ = 156112258176.

The previous prime is 195891639197. The next prime is 195891639221. The reversal of 195891639215 is 512936198591.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 195891639215 - 2²² = 195887444911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5093237 + ... + 5131553.

It is an arithmetic number, because the mean of its divisors is an integer number (14748253338).

Almost surely, 2^195891639215 is an apocalyptic number.

195891639215 is a deficient number, since it is larger than the sum of its proper divisors (40080414193).

195891639215 is a wasteful number, since it uses less digits than its factorization.

195891639215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42218.

The product of its digits is 5248800, while the sum is 59.

The spelling of 195891639215 in words is "one hundred ninety-five billion, eight hundred ninety-one million, six hundred thirty-nine thousand, two hundred fifteen".