Perfectly balanced Memes

The mathematical satisfaction of a factorion is enough to make even Thanos smile. For the uninitiated, a factorion is a number equal to the sum of the factorials of its digits. 40585 = 4! + 0! + 5! + 8! + 5! is one of only four such numbers in base 10. Finding these rare mathematical unicorns brings balance to the numerical universe in a way that would make the Mad Titan proud. Mathematicians spend years hunting these creatures, only to find that perfectly balanced equations are indeed as rare as infinity stones.