Actually working as a commercial pilot you will either have to work for someone else who will justifiably have demands on your time as an employee, or own your own business which will place even more demands on your time. To fly professionally and do something else is an exercise in de-conflicting schedules, and the flying will necessarily come first in all but the rarest of cases. Flying professionally is also nothing like operating heavy machinery as some people erroneously think. It requires a heavy investment in training, a commitment to proficiency and a lot of reading to build and maintain the required knowledge in what is a rapidly evolving, technologically complex field. It is no exaggeration to say failure to keep up can kill you and anybody unfortunate enough to be with you.
If all you want to do is fly while being a mathematics whizz then I would suggest making Math your primary goal. Make enough money in that and you can indulge yourself with all the toys you want including airplanes.