ISBN 9645786639 hat failed the check­sum digit test.

The following 13 formally correct ISBNs were determined. Starting from these ISBNs the value 9645786639 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: China, People's Republic
ISBNas­su­med er­rorCatalogs for checking
7-6457-8663-9first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Bulgaria
ISBNas­su­med er­rorCatalogs for checking
954-578-663-9second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Iran
ISBNas­su­med er­rorCatalogs for checking
964-508-663-9fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-5746-63-9sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-5781-63-9seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-5786-33-9eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-5786-63-0tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-5786-64-9ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-7586-63-94th and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-978-663-54th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Malaysia
ISBNas­su­med er­rorCatalogs for checking
967-5786-63-9third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Pakistan
ISBNas­su­med er­rorCatalogs for checking
969-578-663-43rd and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Dominican Republic
ISBNas­su­med er­rorCatalogs for checking
9945-786-63-62nd and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de

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