999998500000 has 168 divisors, whose sum is σ = 2590448091840. Its totient is φ = 378943200000.

The previous prime is 999998499991. The next prime is 999998500037. The reversal of 999998500000 is 5899999.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999998499899 and 999998499908.

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 27 ways as a sum of consecutive naturals, for example, 9447369 + ... + 9552631.

It is an arithmetic number, because the mean of its divisors is an integer number (15419333880).

Almost surely, 2^999998500000 is an apocalyptic number.

999998500000 is the 500000-th decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999998500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1295224045920).

999998500000 is an abundant number, since it is smaller than the sum of its proper divisors (1590449591840).

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

999998500000 is an equidigital number, since it uses as much as digits as its factorization.

999998500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105322 (or 105289 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 58.

The spelling of 999998500000 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, five hundred thousand".