I have my favorite numbers too. My favorite number is 47 - the number of letters in the longest word in the English language. It also combines two of my favorite digits 4 and 7. 5 is also one of my favorite digits.
Why do you ask?
These are my favorite numbers to write.
I like the sharp corners and straight lines. 5 isn't all straight, but it does have corners. It's also another reason that I like Z so much. I've been crossing my z's since Algebra II, when I didn't want to confuse the Zs in my equations with 2s.
These are things that keep me sane in my solitude.