It is a strong prime.
It is a cyclic number.
It is a congruent number.
Almost surely, 257516112121981 is an apocalyptic number.
It is an amenable number.
57516112121981 is an equidigital number, since it uses as much as digits as its factorization.
57516112121981 is an evil number, because the sum of its binary digits is even.
The spelling of 57516112121981 in words is "fifty-seven trillion, five hundred sixteen billion, one hundred twelve million, one hundred twenty-one thousand, nine hundred eighty-one".