They don't stand for anything because they are an invalid arrangement of Roman numerals
Do you mean what do the Roman numerals XXVII stand for? If so then they stand for the number 27.
There is no K in Roman Numerals.
XL1 in roman numerals stand for 41.
In Roman numerals LXI is equivalent to 61
264
87
166
55
532
It is: 778
400