19999800108 has 72 divisors (see below), whose sum is σ = 50836443840. Its totient is φ = 6629575680.

The previous prime is 19999800061. The next prime is 19999800169. The reversal of 19999800108 is 80100899991.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9609628 + ... + 9611708.

It is an arithmetic number, because the mean of its divisors is an integer number (706061720).

Almost surely, 2^19999800108 is an apocalyptic number.

19999800108 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19999800108 is an abundant number, since it is smaller than the sum of its proper divisors (30836643732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19999800108 is a wasteful number, since it uses less digits than its factorization.

19999800108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447 (or 3442 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 54.

The spelling of 19999800108 in words is "nineteen billion, nine hundred ninety-nine million, eight hundred thousand, one hundred eight".