A 4-bit nibble has 2^4 = 16 possible representations and we can symbolise any one of these representations using just one hexadecimal (base 16) digit.
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In the hex editor there are sixteen hex digits (0 to 9, A to F) and each one represents four bits. Two hex digits represent a byte, which can have a value from 00 to FF. This kind of notation is universally used in computing.
1 million < 165 so 6 digits would be enough.
409610
There is no x in a hex number. And, if it represents multiplication, then anything multiplied by 0 is 0 - in any base.
6. Here is a hint... Hex. Remember that six has an x in it. And hex has 6 sides.