999985000000 has 224 divisors, whose sum is σ = 2834870867712. Its totient is φ = 342840000000.

The previous prime is 999984999971. The next prime is 999985000039. The reversal of 999985000000 is 589999.

It is a tau number, because it is divible by the number of its divisors (224).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999984999899 and 999984999908.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34985715 + ... + 35014285.

Almost surely, 2^999985000000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999985000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1417435433856).

999985000000 is an abundant number, since it is smaller than the sum of its proper divisors (1834885867712).

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

999985000000 is an frugal number, since it uses more digits than its factorization.

999985000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28625 (or 28585 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 49.

Adding to 999985000000 its reverse (589999), we get a palindrome (999985589999).

The spelling of 999985000000 in words is "nine hundred ninety-nine billion, nine hundred eighty-five million", and thus it is an aban number.