19981851198 has 32 divisors (see below), whose sum is σ = 40500518400. Its totient is φ = 6571473216.

The previous prime is 19981851173. The next prime is 19981851217. The reversal of 19981851198 is 89115818991.

It is a happy number.

It is a Curzon number.

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 in 15 ways as a sum of consecutive naturals, for example, 206833 + ... + 287651.

It is an arithmetic number, because the mean of its divisors is an integer number (1265641200).

Almost surely, 2^19981851198 is an apocalyptic number.

19981851198 is an abundant number, since it is smaller than the sum of its proper divisors (20518667202).

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

19981851198 is a wasteful number, since it uses less digits than its factorization.

19981851198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81376.

The product of its digits is 1866240, while the sum is 60.

The spelling of 19981851198 in words is "nineteen billion, nine hundred eighty-one million, eight hundred fifty-one thousand, one hundred ninety-eight".