ISBN 9644631445 hat failed the check­sum digit test.
The following 12 formally correct ISBNs were determined. Starting from these ISBNs the value 9644631445 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 cxi pagxo en Esperanto (x-igata)
ISBN prefix group: China, People's Republic
ISBNas­su­med er­rorCatalogs for checking
7-6446-3144-5first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Bulgaria
ISBNas­su­med er­rorCatalogs for checking
954-463-144-5second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Iran
ISBNas­su­med er­rorCatalogs for checking
964-163-444-54th and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-463-114-5eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-463-144-7tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-463-145-5ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-463-154-48th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-463-744-5seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-464-134-56th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-6431-44-54th and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-96314-4-5fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Malaysia
ISBNas­su­med er­rorCatalogs for checking
967-463-144-5third digit was chan­ged. amazon.co.uk amazon.com amazon.de

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