Is 150 megapixel is highest megapixel?

The best studio still cameras go up to about 50 MP. There is no theoretical reason that 150 or even more could not be used, but the image file size would limit the ability to edit a 150 MP image on anything but a supercomputer.

In Dubai they used a Canon EOS 7D to create a 47 Gigapixel image. And there is a camera with 160MP, which is called the Seitz 6x17 Digital.