ISBN 9791669601 hat failed the check­sum digit test.
The following 14 formally correct ISBNs were determined. Starting from these ISBNs the value 9791669601 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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ISBN prefix group: [no known group prefix]
ISBNas­su­med er­rorCatalogs for checking
67919696011st and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Sweden
ISBNas­su­med er­rorCatalogs for checking
91-976696-0-12nd and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: International NGO Publishers and EU Organizations
ISBNas­su­med er­rorCatalogs for checking
92-9166-960-1second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Philippines
ISBNas­su­med er­rorCatalogs for checking
971-16-6960-93rd and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Portugal
ISBNas­su­med er­rorCatalogs for checking
972-1-66960-1third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Indonesia
ISBNas­su­med er­rorCatalogs for checking
979-1469-60-1fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
979-16666-0-1seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
979-16692-0-1eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
979-16696-0-0tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
979-16696-5-1ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
979-16896-0-1sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
979-466-960-1fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
979-661-960-14th and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Namibia
ISBNas­su­med er­rorCatalogs for checking
99916-67-60-12nd and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de

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