I tried to cipher this equation once in my head...
Nought times nought equals nought, nought plus nought equals nought, nought minus nought equals nought, and nought divided by nought equals nought... No prudent results.
So I broke out my engineering calculator, Big Chief tablet, and trusty red crayon. The calculator started smoking, caught the tablet on fire, melted my crayon, and set off the smoke alarm, which woke the ol' lady up... I'm never doin' that again! LOL!
Seriously, nobody knows the exact number. With people having the three league maximum per team having multiple ID's to join other leagues, Chase league teams that remain inactive until race 27, and teams that have owners who have quit... An educated guess would put the number at 250,000 teams, with approximately 150,000 owners.