Short answers, pulled from the story.
Vicky the Viking is based on the children's novel Vicke Viking, written in 1963 by Swedish author Runer Jonsson. Jonsson won the Deutscher Jugendliteraturpreis, Germany's Children's Book Award, for the novel in 1965.
Vicky the Viking premiered on the 31st of January 1974 on the German TV channel ZDF. It was produced as a German-Japanese co-production between Zuiyo Enterprise Company and ZDF, with copyright registered in 1972.
The original animated series consists of 78 episodes, each 25 minutes long. The series was produced by Zuiyo Eizo and Nippon Animation in Japan, with directors Chikao Katsui, Hiroshi Saitô, and Kôzô Kusuba working on different portions of the run.
The 2009 live-action film directed by Michael "Bully" Herbig grossed approximately $5,595,895 on its opening weekend. It went on to sell nearly five million tickets in Germany, for a total gross of approximately $40,582,384.
Yes. Japanese manga artist Eiichiro Oda has stated that Vicky the Viking heavily influenced him, which led him to serialize One Piece in Shueisha's Weekly Shonen Jump starting in 1997. Manga artist Makoto Yukimura has also cited the series as an inspiration for Vinland Saga, particularly the character Hild.
The music for the German version was composed by Christian Bruhn and Karel Svoboda. The text of the title song was written by Andrea Wagner. The German version also included new brief portions of animation not present in the original Japanese cut.