There are 2 39 digit narcissistic numbers.
A narcissistic number is a number that, when you take all the digits, raise them to the power of how many digits the number has, and add them all together, you get the original number.
For example, 407 is a 3 digit number, and 4^3 + 0^3 + 7^3 = 407.
The number of the day is the average of the 2 39 digit numbers. It begins with one-hundred-fifteen-dodecillion.