number one
Of first rank or importance; foremost; principal.
He is easily America's number one golfer.
Of first grade; of top quality; best.
That is number one western steer beef.
Yourself; your own interests; your private or selfish advantage. Usually used in the phrase look out for number one.
He was well known for his habit of always looking out for number one.
opposite number
A person occupying the same position as someone in a different group, organization, or country.
The opposite number of the President of the United States in Germany is the Chancellor of the Federal Republic.
quite a few
quite a number
not a few
Rather a large number; more than a few.
Quite a few went to the game.
The basket had quite a few rotten apples in it.
Quite a few students were absent yesterday, in fact, more than half of them were not there.
We did not expect many people to attend the affair, but quite a few of our friends actually came.
The phrase quite a number is used like an adjective only before less, more.
Few people saw the play on the first night but quite a number more came on the second night.
Sometimes used like an adverb.
We still have quite a few more miles to go before we reach New York.
safety in numbers
Protection against trouble by being in a group.
Peter said, "Stay in a group; there is safety in numbers."