Click the cat and enter the number. The number is displayed in the orange box. The larger a number is, the longer it takes to calculate (with some exceptions, like 14 and 13 or 8325787 and 10000000). If you enter a number higher than 10^17 (100 quadrillion for short scale and 100 billiard for long scale) rounding errors will occur and prime numbers might become divisible by 2.
I thought of this in the shower. (and part of the code) The timer will show the smallest factor of a number, excluding itself. You can also click the cat while calculating to stop the calculation.
