19888555682 has 6 divisors (see below), whose sum is σ = 29833132689. Its totient is φ = 9944178120.

The previous prime is 19888555679. The next prime is 19888555733. The reversal of 19888555682 is 28655588891.

It can be written as a sum of positive squares in 2 ways, for example, as 19669782001 + 218773681 = 140249^2 + 14791^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99721.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 149582 + ... + 249302.

Almost surely, 2^19888555682 is an apocalyptic number.

19888555682 is a deficient number, since it is larger than the sum of its proper divisors (9944577007).

19888555682 is an frugal number, since it uses more digits than its factorization.

19888555682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199444 (or 99723 counting only the distinct ones).

The product of its digits is 55296000, while the sum is 65.

The spelling of 19888555682 in words is "nineteen billion, eight hundred eighty-eight million, five hundred fifty-five thousand, six hundred eighty-two".