19887717899 has 8 divisors (see below), whose sum is σ = 22749662208. Its totient is φ = 17030984040.

The previous prime is 19887717887. The next prime is 19887717929. The reversal of 19887717899 is 99871778891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19887717899 - 2³² = 15592750603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19887717799) 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 7 ways as a sum of consecutive naturals, for example, 1294427 + ... + 1309700.

It is an arithmetic number, because the mean of its divisors is an integer number (2843707776).

Almost surely, 2^19887717899 is an apocalyptic number.

19887717899 is a deficient number, since it is larger than the sum of its proper divisors (2861944309).

19887717899 is a wasteful number, since it uses less digits than its factorization.

19887717899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605225.

The product of its digits is 128024064, while the sum is 74.

The spelling of 19887717899 in words is "nineteen billion, eight hundred eighty-seven million, seven hundred seventeen thousand, eight hundred ninety-nine".