Significance of 7?

QUESTION?
What is it about the number “7” that is so often present in the tales and the stories about Gondolin ?

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From: "The Silmarillion:"Then Tuor looked down upon …… Gondolin the great, city of SEVEN names,
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From: UT:
And one day, as Tuor sat upon the shore, he heard the rush and whine of great wings, and he looked up and saw SEVEN white swans flying in a swift wedge southward.
…… and he took the SEVEN feathers(of the swans) and set them in the crest of his helm……

Now Tuor journeyed south along the coast for full SEVEN days……

Voronwe: I will not darken your heart son of Middle-earth, with the tale of my labour SEVEN years in the Great Sea from the North even into the South……

"Yea, indeed," said Voronwë; "to a stranger it might seen that pride has made the servants of Turgon pitiless. Long and hard seem the leagues of the SEVEN Gates to the hungry an wayworn."

SEVEN great pillars of steel there were, tall with the height and girth of strong young trees, but ending in a bitter spike that rose to the sharpness of a needle; and between the pillars were SEVEN cross-bars of steel, and in each space SEVEN times SEVEN rods of steel upright, with heads like the broad blades of spears……..

…. Silent upon either hand stood a host of the army of Gondolin; all of the SEVEN kinds of the Seven Gates were there represented; but their captains and chieftains were upon horses, white and grey.
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From "The Fall of Gondolin", LT:
And Ilfiniol was fain of that, but said he: 'It is amighty tale, and SEVEN times shall folk fare to the Tale-fire ere it be rightly told;

But now the men of Melko have assembled their forces, and
SEVEN dragons of fire are come with Orcs …….

Then said Idril: "Woe is me whose father awaiteth doom evenupon his topmost pinnacle; but SEVEN times woe whose lord hath gone down before Melko and will stride home no more!" ……

Now the Mountains or rather their lowest hills were on that side SEVEN leagues save a mile from Gondolin, …….

Of the wolfriders there were a score, and of the men that were about Earendel but six living = 7

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I think it would be fairer to say that if six is the devil's number it is because it is one less than seven.

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