How many books has James Patterson written with other writers?

James Patterson has written over 100 books in his career, and he's known for collaborating with other authors. It's hard to give an exact number of books written with other writers, as he often collaborates with different writers on different series and individual books.

However, he has established a regular pattern of co-writing, often with authors specializing in different genres like thriller, mystery, and even young adult fiction. Some of his most popular co-authored series include:

* Women's Murder Club with Alicia Berenson

* Alex Cross series with Richard DiLallo

* Private series with Howard Roughan

* The Michael Bennett series with Maxine Paetro

It's safe to say that a significant portion of James Patterson's book output involves collaboration with other authors. This allows him to explore different genres and stories while maintaining his consistent publishing schedule.