I don't have the exact number of chapters for Chainsaw Man manga off the top of my head. Usually, you can find this information on manga-related websites or by referring to the publisher's updates.
The Chainsaw Man manga has approximately 119 chapters. This count includes the main story arcs and some supplementary chapters that expand the lore and character development.
There were a few novels related to the chainsaw man that could be recommended. One of them was " Chainsaw Man: I Have Two Divine Powers ", written by Stupid War-chan. The story was about the protagonist, Kotone Shallow Feather, who had transmigrated to the world of the chainsaw people and obtained the power of the Divine Eyes. The other was Chainsaw Man: I Have Two Demons, written by Thirteenth Wang.
You should avoid reading it for free as it's illegal and unethical. It's best to support the creators by purchasing or subscribing through legal channels.