issue with editing crontab in AWS ubuntu instance

I have created a cronjob in my local system using crontab -e

crontab -e

Its opening Nano editor in local Ubuntu system. Then I added my cronjob. Thats fine.

But facing issue in AWS instance . I tried same with my Ubuntu EC2 instance .

I connected AWS instance using SSH. Ran crontab -e

Its giving

ubuntu@ip-1562-361-466-45563:~$ crontab -e
945

What is this 945, if i apply sudo its giving 888

why its not opening any editor like Nano or Vi.?