I would try viewing it in
gimp. Should be in your distros' repositories, main website's here. Lots of tutorial are available through a simple google search.
When I tried to open your image size I needed to up Gimp's default paging limit so that it could accommodate it. It's under the menu Edit -> Preferences:
If Gimp can't handle the image or you want something lighter then you might want to try
feh. Feh's main web site is here. Again should be in repositories. You can run it from the terminal like this:
feh -F <image>
This will size it to fit the screen.