They also don't use signed integers, in the sense that computer languages use the term. Signed integers are also bounded in extent, and for most systems wrap on

They also don't use signed integers, in the sense that computer languages use the term. Signed integers are also bounded in extent, and for most systems wrap on over/underflow. Euler's Theorem doesn't hold for them any more than it does for unsigned integers. Don't treat computer "integers" like mathematical integers. It leads to pain. They're members of a few finite fields.