International Standard Version In this case wisdom is needed: Let the person who has understanding calculate the total number of the beast, because it is a human total number, and the sum of the number is 666.

American Standard Version Here is wisdom. He that hath understanding, let him count the number of the beast; for it is the number of a man: and his number is Six hundred and sixty and six.

Young's Literal Translation Here is the wisdom! He who is having the understanding, let him count the number of the beast, for the number of a man it is, and its number is six hundred and sixty six.