The comments_number function is in the wp-includes/comment-template.php file.
PHP Code:
* @param string $zero Text for no comments
* @param string $one Text for one comment
* @param string $more Text for more than one comment
and
PHP Code:
function comments_number( $zero = false, $one = false, $more = false, $deprecated = '' ) {
.....
$output = str_replace('%', number_format_i18n($number), ( false === $more ) ? __('% Comments') : $more);
.....
$output = ( false === $zero ) ? __('No Comments') : $zero;
.....
$output = ( false === $one ) ? __('1 Comment') : $one;
So what you pass as aguments will get used instead of the default "# Comment(s)".
If you want only the number without the text, try passing only the "%" placeholder as the argument.
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