The Hebrew and Greek alphabet does not have separate characters or alphabets for numbers and letters. Letters are also used as numbers. So each letter is a numerical value.
The Hebrew equivalent of our "w" is the letter "vav" or "waw". The numerical value of vav is 6. So the English "www" transliterated into Hebrew is "vav vav vav", which numerically is 666.The English equivalent is below the Hebrew letter (in parenthesis).
The number value of the Hebrew letter is below the English letter.
The "vav" or English "w" or "6" is highlighted in yellow.
By the way, Hebrew reads right to left. vav vav vav = www = 666