This will be particularly easy in xslt2:

 <xsl:stylesheet
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
                                 version="2.0">
  
  <xsl:output method="text" /> 
 

<xsl:template match="/">
<xsl:number value="65314142" format="w"/>
</xsl:template>

 </xsl:stylesheet>



$ saxon8 words.xsl words.xsl
sixty five million three hundred and fourteen thousand one hundred and forty two


David

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