Who am I?    n°3

I am a number with 6 digits.
All my digits are odd.
My 'tens' is greater than my 'thousands' digit.
My 'units' digit is one third of my 'hundreds' digit.
My 'thousands' digit is 7.
My 'hundreds' digit is the same as my 'tens' digit.
My first digit is 5.
My 'tens of thousands' digit is different to all the others.

Who am I?

I am the number


If you get stuck, use pen and paper to help you figure it out!