Native speaker
In Emirati Arabic, “Sixty (60)” is ستين (siteen).
ستين
Sixty (60)
It's in the phrasebook under Numbers, prices & money, with 36 more like it.
khamseen
sab'een
arba'een
thmaaneen
tisi'taa'ash
tis'een
Source: DLIFLC Emirati Basic Language Survival Kit (2007). Credits and licences