The calculated distance (air line) between Veľký Krtíš and Prievidza is approximately 51 miles respectively 82 kilometers.
By car or train, the actual journey to Prievidza is certainly longer, as only the direct route (as the crow flies) between Veľký Krtíš and Prievidza has been calculated here.
Air line (approximately)
82 kilometers
44 nautical miles