Berean Study Bible
Here is a call for wisdom: Let the one who has insight calculate the number of the beast, for it is the number of a man, and that number is 666.

King James Bible
Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six.

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.

Darby Bible Translation
Here is wisdom. He that has understanding let him count the number of the beast: for it is a man's number; and its number [is] six hundred [and] sixty-six.

Douay-Rheims Bible
Here is wisdom. He that hath understanding, let him count the number of the beast. For it is the number of a man: and the number of him is six hundred sixty-six.

English Revised 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.