The Lightning Network as a whole has a density of 0.2%. That means that out of all the channel that could exist, only 0.2% do.

If you took the betweenness centrality of every node:

Top 1000Top 1000

• Connections between the top 1000 nodes would account for 42% of existing network connectivity.
• The subgraph of the top 1000 nodes has a density of 6%.

Top 100Top 100

• Connections between the top 100 nodes would account for 4% of existing network connectivity.
• The subgraph of the top 100 nodes has a density of 30%.

# 1# 1

• The #1 node has direct channels with 25% of the network.