19678195915 has 12 divisors (see below), whose sum is σ = 27469155456. Its totient is φ = 13493619888.

The previous prime is 19678195907. The next prime is 19678195931. The reversal of 19678195915 is 51959187691.

It is not a de Polignac number, because 19678195915 - 2³ = 19678195907 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 40159339 + ... + 40159828.

It is an arithmetic number, because the mean of its divisors is an integer number (2289096288).

Almost surely, 2^19678195915 is an apocalyptic number.

19678195915 is a deficient number, since it is larger than the sum of its proper divisors (7790959541).

19678195915 is an equidigital number, since it uses as much as digits as its factorization.

19678195915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80319186 (or 80319179 counting only the distinct ones).

The product of its digits is 6123600, while the sum is 61.

The spelling of 19678195915 in words is "nineteen billion, six hundred seventy-eight million, one hundred ninety-five thousand, nine hundred fifteen".