One of the least useful facts I somehow remember is that a quarter has 119 reeds around its edge, while a dime has 118. I don’t know about half dollars or the various dollar coins, and I’m not going to count them.
OK, I had to look it up. From mentalfloss.com:
“...the Mint lists its reeding specifications as follows: dimes, 118; quarters, 119; half dollars, 150; dollar, 198; Susan B. Anthony dollar, 133.”