Pretty sure it depends on whether or not it can make a homophonic phrase in Chinese at that length. There isn't to much coverage of 7N.com domains selling but I'd expect names with special meaning like 5201314.com (I love you forever) to have significant value.
Thanks for your input, but these numbers have no any connection to Chinese meaning, these are completely different niche, try to google the examples above if you're interested.
Thanks for your input, but these numbers have no any connection to Chinese meaning, these are completely different niche, try to google the examples above if you're interested.