How many books has Isaac Asimov written?

Isaac Asimov was a prolific writer, and it's difficult to give an exact number of books he wrote due to different ways of counting.

Here's a breakdown:

* According to his official website, he wrote over 500 books. This includes novels, short story collections, essays, non-fiction works, and even science textbooks.

* Some sources state he wrote 492 books. This number likely excludes some later works that were published posthumously.

* He also wrote thousands of articles and stories. These often weren't collected into book form but were published in magazines and anthologies.

Ultimately, the exact number is hard to pinpoint, but it's safe to say Isaac Asimov was one of the most prolific and influential writers of the 20th century.