It's so hot that its surface is fully covered by lava oceans.
How the 'hell planet' got so hot: New measurements reveal the orbital path of planet 55 Cnc e, https://phys.org/news/2022-12-hell-planet-hot-reveal-orbital.html
My note. This is a five-exoplanet system where the planets do not orbit around the host star in a flat plane. 55 Cnc e seems to do this, the other four are exceptions. Planet migration scenarios are used to explain the present orbit of 55 Cnc e. ref - Measured spin–orbit alignment of ultra-short-period super-Earth 55 Cancri e, https://www.nature.com/articles/s41550-022-01837-2, 08-Dec-2022. “Abstract A planet’s orbital alignment places important constraints on how a planet formed and consequently evolved. The dominant formation pathway of ultra-short-period planets is particularly mysterious as such planets most likely formed further out, and it is not well understood what drove their migration inwards to their current positions...
My note."The spin–orbit alignment of 55 Cnc e favours dynamically gentle migration theories for ultra-short-period planets, namely tidal dissipation through low-eccentricity planet–planet interactions and/or planetary obliquity tides." My note, gentle migration theories. 55 Cnc e is documented at http://exoplanet.eu/catalog/55_cnc_e/
This is a five-exoplanet system. Using properties at exoplanet.eu for 55 Cnc e I calculate P=6.9550E-01 day or 0.6955 day. The published value=0.7365478 day. In 1 Gyr, 5.2516E+11 revolutions could be completed or more than 525 billion revolutions. The host star is said to be 10.2 Gyr old. More than 5 trillion revolutions now. Apparently, some type of gentle migration scenario is required to explain this exoplanet and five planet system.
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