WordPress function/template tag to get first n words of the content

Yep, wp_trim_words():

 <?php $trimmed = wp_trim_words( $text, $num_words = 55, $more = null ); ?>

Or in your case:

<?php echo apply_filters( 'the_content', wp_trim_words( strip_tags( $post->post_content ), 55 ) ); ?>

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