ISBN 9642490550 hat failed the check­sum digit test.
The following 14 formally correct ISBNs were determined. Starting from these ISBNs the value 9642490550 that you input could have resulted frome one error (error in one digit or transposition of two digits.) You can now check using the links given for the catalogs of amazon.co.uk, amazon.com and amazon.de whether any book is listed for the respective URL. To the home page
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Tiu ĉi paĝo en Esperanto (Unikodo)
Tiu cxi pagxo en Esperanto (x-igata)
ISBN prefix group: Japan
ISBNas­su­med er­rorCatalogs for checking
4-642-99055-01st and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: China, People's Republic
ISBNas­su­med er­rorCatalogs for checking
7-6424-9055-0first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Bulgaria
ISBNas­su­med er­rorCatalogs for checking
954-24-9055-0second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Iran
ISBNas­su­med er­rorCatalogs for checking
964-209-055-45th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-240-955-06th and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-245-055-0sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-249-025-0eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-249-055-2tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-249-056-0ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-249-655-0seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-2890-55-0fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-429-055-04th and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-7490-55-0fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Malaysia
ISBNas­su­med er­rorCatalogs for checking
967-2490-55-0third digit was chan­ged. amazon.co.uk amazon.com amazon.de

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