Hungarian
here’s a Hungarian translation sent to me by someone who wishes to remain anonymous:
The numbers from zero to six:
0: nulla
1: egy
2: kettő
3: három
4: négy
5: öt
10: hat
Hungarian base-ten numbers are compounded above ten (i.e. eleven and twelve are ten-one and ten-two). Based on the French translations, I will use compound numbers from seven.
In base ten, numbers from 11-19 and 20-29 are compounded as 10-en-X and 20-on-X. I will apply this rule in base six from seven to eleven:
11: hatonegy
12: hatonkettő
13: hatonhárom
14: hatonnégy
15: hatonöt
Let's use the Hungarian word for dozen, "tucat", for the number twelve:
20: tucat
21: tucategy
22: tucatkettő
23: tucathárom
24: tucatnégy
25: tucatöt
Inspired by the second syllable of "tucat", let's use the ending -cat/-cet (based on vowel harmony) for multiples of six:
30: hacat
31: hacategy
...
40: necet
41: necetegy
...
50: öcet
51: öcetegy
I suggest translating nif to Hungarian as "niv" based on the Finnish translation.
My suggestion is based on the phonetic evolution of the word for hundred, *śata --> száz (hu), sata (fi), which results in the analogical evolution of *nif --> niv (hu), nivi (fi).
100: niv
101: nivegy
102: nivkettő
...
110: nivhat
111: nivhatonegy
112: nivhatonkettő
...
155: nivöcetöt
"Kettő" usually becomes "két" when before "száz" (hundred) except when intentionally distinguishing it from "hét" (seven) which won't exist in seximal. Thus, "kettő" will become "két" before "niv" as well.
200: kétniv
Following the hyphenation rules for numbers above two thousand, the numbers should also be hyphenated after "niv" for numbers larger than two nif:
200: kétniv
201: kétniv-egy
202: kétniv-kettő
203: kétniv-három
204: kétniv-négy
205: kétniv-öt
210: kétniv-hat
211: kétniv-hatonegy
300: háromniv
400: négyniv
500: ötniv
1000: hatniv
1100: hatonegyniv
5555: öcetötniv-öcetöt
Numbers from 10000:
10^4: exia
10^8: biexia
10^12: triexia
10^16: kvadexia
10^20: kvintexia
10^24: unnullexia
10^28: ununexia
10^32: unbiexia
10^36: untriexia
10^40: unkvadexia
10^44: unkvintexia
10^48: binullexia
In exian, the n is removed as the Hungarian word for million, "millió" does not contain an n either. It is not accented though, as a word ending in á sounds odd.
Nil becomes null; quad becomes kvad and pent becomes kvint (as quadrillion is "kvadrillió" and quintillion is "kvintillió" in Hungarian.
Two thousand and twenty in Hungarian seximal: 13204 - egyexia-hacatkétniv-négy