'Number' in the Bible

Then I looked and heard the voice of many angels around the throne, and also of the living creatures and of the elders. Their number was countless thousands, plus thousands of thousands.

So a white robe was given to each of them, and they were told to rest a little while longer until the number would be completed of their fellow slaves and their brothers, who were going to be killed just as they had been.

And I heard the number of those who were sealed:144,000 sealed from every tribe of the Israelites:

After this I looked, and there was a vast multitude from every nation, tribe, people, and language, which no one could number, standing before the throne and before the Lamb. They were robed in white with palm branches in their hands.

The number of mounted troops was 200 million; I heard their number.

so that no one can buy or sell unless he has the mark: the beast’s name or the number of his name.

Here is wisdom: The one who has understanding must calculate the number of the beast, because it is the number of a man. His number is 666.

I also saw something like a sea of glass mixed with fire, and those who had won the victory over the beast, his image, and the number of his name, were standing on the sea of glass with harps from God.

and will go out to deceive the nations at the four corners of the earth, Gog and Magog, to gather them for battle. Their number is like the sand of the sea.