I'm developing a story where Earth is obliterated by an asteroid and the small mars colony collapses into chaos shortly after.
The last survivor enters a criogenic chamber for indefinite amount of time only to be awakened thousands of years later by alien archeologists from an intergalactic, multi-species, civilization.

I thought that i needed an universal measurement system and i thought about using SI anyway, with base measures that can derive all the other measures, but using Planck Units, being the smallest units possible, but it would result in unwieldly big numbers at the macro level.

And it's not as simple as determining prefixes for 10, 100, and 1000 units for example because it's not garanteed that every species will use base 10 numerical systems.

Humans stuck to base 10 probably because we have 10 fingers (even though some societies used other bases when it was advantageous, like base 60 for measuring angles because it could be divided into more whole numbers) and didn't want it to be an arbitrary decision but rather a logical one based on a constant natural quantity.

So I thought about using binary because it's the simplest number system, though it would result in unpractically big numbers nonetheless.

Do you have any better idea?