198512500000 has 108 divisors (see below), whose sum is σ = 488557367046. Its totient is φ = 79400000000.

The previous prime is 198512499973. The next prime is 198512500001. The reversal of 198512500000 is 5215891.

It can be written as a sum of positive squares in 9 ways, for example, as 196890988176 + 1621511824 = 443724^2 + 40268^2 .

It is not an unprimeable number, because it can be changed into a prime (198512500001) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12492060 + ... + 12507940.

Almost surely, 2^198512500000 is an apocalyptic number.

198512500000 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 198512500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244278683523).

198512500000 is an abundant number, since it is smaller than the sum of its proper divisors (290044867046).

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

198512500000 is an frugal number, since it uses more digits than its factorization.

198512500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15931 (or 15888 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 31.

Adding to 198512500000 its reverse (5215891), we get a palindrome (198517715891).

The spelling of 198512500000 in words is "one hundred ninety-eight billion, five hundred twelve million, five hundred thousand".