Bitcoin block 666666 had been mined a little over 2 years ago. Not that it has any significance outside of the Bitcoin monetary policy not having changed in 777777 blocks.
At an average of 10 minutes per block it will take roughly another 16.5 Hours until we get there.
Tick tock, next block…
In HEX, #777777 is a 46.7% gray in RGB color spectrum.