Indonesian
Indonesian has separate names for every number up to eleven, which all can be preserved.
0: nol
1: satu
2: dua
3: tiga
4: empat
5: lima
10: enam
11: tujuh
12: delapan
13: sembilan
14: sepuluh
15: sebelas
Indonesian then uses "belas" to mean "plus ten" until it reaches two tens, somewhat like the English -teen suffix. from there, the word "puluh", derived from "sepuluh", starts being used to mean "times ten". for seximal, we can remove the first syllable of "enam" to make the analogous word "nam", which is actually already a recognizable way to say "six" in Indonesian if Wiktionary is to be believed.
20: dua nam
21: dua nam satu
22: dua nam dua
23: dua nam tiga
24: dua nam empat
25: dua nam lima
30: tiga nam
40: empat nam
50: lima nam
for larger powers of six, we can just loan nif and the -exian series. Indonesian phonology doesn't allow the sequence /ks/, so -exian becomes -ekasian.
100: nif
101: nif satu
110: nif enam
120: nif dua nam
200: dua nif
1 0000: unekasian
1 0000 0000: biekasian