regarding the alchemy thing pic related,
let us take a look at genesis
Peter 3:8>‘But do not forget this one thing, dear friends: With the Lord a day is like a thousand years, and a thousand years are like a day. The Lord is not slow in keeping his promise, as some understand slowness. He is patient with you, not wanting anyone to perish, but everyone to come to repentance.’
The 6 days are not actual 6 days but 6.000 years (if you take the literall interpretation, or it may just mean "a very long time is for God like 1 day", in which case its 6 very long times.)
Furthermore the numbers of days are symbolical. In example:
On 4th day is where the physical universe is completed and only living creatures are missing in the bible.
If you go into the egyptian creation myth, the ogdoad, you also have the 4 primordial forces coming together (of which kek was one) creating this world.
In modern phydics even you have the 3 spatial dimensions plus time being again 4 things making up this world.
in alchemi there are 4 elements making up the material realm, with the spirit being above it. (also look what the alchemic symbols forthe elemts look like when overlayered)
All talk about the same eternal truth of a certain principle and thus encode the same number for the same things, the 4
On the 6 day man was created and so is 6 the number of man, and his weakness. greed, egoism, egocentrism, all the materialistic desires, and i believe of this existence on this plane in general (the earth is tilted 23,4 degrees, or if you count from the other direction 66.6 degrees, life, on this planet at least, is made of carbon, the 6th element, with 6 protons, 6 neutrons and 6 electrons. 6 directions in the material realm, north, south, west, east, up and down, 6 sides of the cubes. saturn being the 6th planet). 666 is going over the top with the materialistic desires, pursuing and desiring only those and making you follow the path of satan