how is he treated by lilliputians? why is gulliver impressed by them? What amazing qualities do these tiny mortals possess?

When Gulliver awakens in Lilliput, he is lying on his back. He finds himself unable to sit up or move at all. His "Arms and Legs were strongly fastened on each side to the Ground; and [his] Hair, which was long and thick, tied down in the same manner." He feels something moving along his body almost up to his chin, at which point he sees that it is "a human Creature not six Inches high, with a Bow and Arrow in his Hands, and a Quiver at his Back." Gulliver will later learn that these creatures are called Lilliputians. Startled by this sight, Gulliver roars out and soon manages to free his left arm. The frightened Lilliputians fire dozens of tiny arrows into his hand, face, and body until he lies calmly.

Gulliver admits that as he lies on the ground he often thinks of taking up fifty of the small creatures in his hand and crushing them-but he does not want to be pricked with arrows again, and he has given his "Promise of Honour" to behave in exchange for good treatment. Gulliver finds the Lilliputians mathematically brilliant but silly. 

Gulliver was treated well by them. They showed nice hospitality towards him. Gulliver was impressed by them because he is much bigger than them buy they were not afraid him. These people are most excellent mathematicians and arrived to a great perfdection in mechanics.