Mathematical Digits are TEN
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If "make" is limited to ordering the digits, then 24. If mathematical operations are permitted then several million, at least.
6
A quadrillion has 16 digits.
6 digits
There are 90 of them that can be formed by concatenation (writing them side-by-side). You can, of course, form lots more by using mathematical operations. Foe example, 99 = 387,420.489. Combining factorials and powers will give numbers with more than 2 million digits!