19998000050 has 54 divisors (see below), whose sum is σ = 43284292407. Its totient is φ = 6854057280.

The previous prime is 19998000047. The next prime is 19998000073. The reversal of 19998000050 is 5000089991.

It can be written as a sum of positive squares in 5 ways, for example, as 10708317361 + 9289682689 = 103481^2 + 96383^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99995.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19997999971 and 19998000007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6998222 + ... + 7001078.

Almost surely, 2^19998000050 is an apocalyptic number.

19998000050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19998000050 is an abundant number, since it is smaller than the sum of its proper divisors (23286292357).

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

19998000050 is an frugal number, since it uses more digits than its factorization.

19998000050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5740 (or 2871 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 41.

The spelling of 19998000050 in words is "nineteen billion, nine hundred ninety-eight million, fifty", and thus it is an aban number.