What advantage did the Byzantine Empire have that enabled it to survive as a political entity for a thousand years longer than the western part of the Roman Empire?

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The Byzantine Empire had a stronger military, which enabled it to defend itself against external threats and expand its territory. It also had access to Greek fire, a powerful weapon that was used in naval warfare. Additionally, the Byzantines were able to adapt and innovate in response to changing circumstances, such as the rise of Islam and the threat of the Crusaders. These factors helped the Byzantine Empire to survive as a political entity for much longer than the western part of the Roman Empire.

What Advantage Did the Byzantine Empire Have That Enabled It