(MAYBE ONLY) Mathematically, there is no biggest number because if you were to identify any number and call it the biggest, it would always be possible to make a bigger one. Big number +1 = bigger number. Perhaps the answer you are looking for is infinity. (ACTUAL ANSWER) INFINITY IS A MATH SYMBOL .Plus the biggest number is a googaplax. Even if you say googaplax +1 (or bigger)there is no such thing.