ISBN 9686664639 hat failed the check­sum digit test.
The following 13 formally correct ISBNs were determined. Starting from these ISBNs the value 9686664639 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: English language
ISBNas­su­med er­rorCatalogs for checking
0-686-66463-9first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Yugoslavia
ISBNas­su­med er­rorCatalogs for checking
86-966646-3-91st and 3rd digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Israel*
ISBNas­su­med er­rorCatalogs for checking
9656664639third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Ukraine
ISBNas­su­med er­rorCatalogs for checking
966-8664-63-93rd and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Mexico
ISBNas­su­med er­rorCatalogs for checking
968-16-6463-9fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
968-6264-63-9fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
968-6646-63-96th and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
968-6663-64-97th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
968-6664-62-9ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
968-6664-63-7tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
968-6664-93-9eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
968-6669-63-9seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Nigeria
ISBNas­su­med er­rorCatalogs for checking
978-66646-3-9second digit was chan­ged. amazon.co.uk amazon.com amazon.de

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