How many letters does the top answer for “wrote analytical engine” have?

The most common answer is babbage (7 letters).

Crossword clue: wrote analytical engine

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

babbage 7 letters wd-fact-v3

author of analytical engine 50% similar → babbage

wrote difference engine 50% similar → babbage