I don't really know. It could vary depending on the artistic style and the intentions of the comic's author. You might need to do some in-depth research or check with the comic's fan community for a clear answer.
I don't have the exact count. Sometimes the number of comics in a volume can vary depending on how they're packaged and distributed. You might have better luck reaching out to comic book publishers or libraries that specialize in comics.
The Invincible comics don't have nudity. They adhere to a standard of presenting exciting plots and engaging characters without including such elements.
The Invincible comics are finished. There's no more new content coming out in the comic series. But you can still enjoy the existing issues and re-read them for a great experience.