The concept of infinity is often seen as an incomprehensible concept that is beyond the grasp of the human mind. However, it is still possible to consider numbers that are even larger than infinity. While these numbers may be impossible to truly comprehend, they can still be discussed and considered.

The concept of a number that is even larger than infinity is known as a "hypernumber". A hypernumber is a number that is larger than infinity, but still follows the same mathematical rules as other numbers. For example, a hypernumber can be added, subtracted, multiplied, and divided just like any other number.

The largest hypernumber is known as the "Graham's number". Graham's number is a very large number that is estimated to be larger than the number of atoms in the universe. It is so large that it is impossible to even express it in scientific notation. In fact, even if we were to use the entire universe to represent the number, it would still be too small.

Although the actual size of Graham's number is impossible to truly comprehend, it is still possible to consider its magnitude. For example, if we were to take the number one and multiply it by itself a trillion times, it would still be a tiny fraction of Graham's number. This is because Graham's number is so large that it contains an infinite number of zeros.

So while it may be impossible to truly comprehend, Graham's number is still considered to be the biggest number besides infinity. It is a number so large that it is impossible to express it in scientific notation and even if we were to use the entire universe to represent it, it would still be too small.