19816798886 has 4 divisors (see below), whose sum is σ = 29725198332. Its totient is φ = 9908399442.

The previous prime is 19816798861. The next prime is 19816798891. The reversal of 19816798886 is 68889761891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68889761891 = 10459 ⋅6586649.

It is a congruent 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 as a sum of consecutive naturals, namely, 4954199720 + ... + 4954199723.

It is an arithmetic number, because the mean of its divisors is an integer number (7431299583).

Almost surely, 2^19816798886 is an apocalyptic number.

19816798886 is a deficient number, since it is larger than the sum of its proper divisors (9908399446).

19816798886 is an equidigital number, since it uses as much as digits as its factorization.

19816798886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9908399445.

The product of its digits is 83607552, while the sum is 71.

The spelling of 19816798886 in words is "nineteen billion, eight hundred sixteen million, seven hundred ninety-eight thousand, eight hundred eighty-six".