What is so unusual about this number?

3608528850368400786036725

This is a easy one...Because our membr smartcoder already discuss with this puzzle..

Here is the answer...

The first single digit is divisible by 1
The first two digits are divisble by 2
The first three digits are divisible by 3
The first four digits are divisible by 4
.
.
.
and so on...

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suresh