199980000000 has 864 divisors, whose sum is σ = 794044060992. Its totient is φ = 48000000000.

The previous prime is 199979999993. The next prime is 199980000023. The reversal of 199980000000 is 89991.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 199980000000.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 10100 × 9900 × 2000.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1979999950 + ... + 1980000050.

It is an arithmetic number, because the mean of its divisors is an integer number (919032478).

Almost surely, 2^199980000000 is an apocalyptic number.

199980000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199980000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (397022030496).

199980000000 is an abundant number, since it is smaller than the sum of its proper divisors (594064060992).

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

199980000000 is an frugal number, since it uses more digits than its factorization.

199980000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

Adding to 199980000000 its reverse (89991), we get a palindrome (199980089991).

The spelling of 199980000000 in words is "one hundred ninety-nine billion, nine hundred eighty million", and thus it is an aban number.