Bella\textquotesingle s phone number is a seven digit number, Please infer those digits from Bella\textquotesingle s words.  First digit: the smallest multiple of $5$.  Second digit: the smallest odd number among the natural numbers.  Third digit: in a single digit, the largest odd number.  Fourth place: in nature, the smallest even number.  Fifth digit: the largest single digit that is a multiple of $2$.  Sixth digit: the smallest odd number greater than $1$ in nature.  Seventh digit: I don\textquotesingle t know, but my home phone number is both a multiple of $2$ and a multiple of $5$. (The above is the order from high to low) 
Overseas Competition->Knowledge Point->Number Theory Modules->Odd and Even Numbers