11^11
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To form the largest even number, the last digit must be even, which means it can be either 8, 4, or 2. Placing the largest even digit, 8, in the ones place, we can continue selecting the next largest digits in descending order until all digits are used.
120
4^5827 which is approximately 1.597973114x103508
Using only 8's & 4's and using each atleast once...884. Using all numerals and including 8 once and 4 once...984.
1660 MCLX