57516112120781 has 2 divisors, whose sum is σ = 57516112120782. Its totient is φ = 57516112120780.

The previous prime is 57516112120771. The next prime is 57516112120811. The reversal of 57516112120781 is 18702121161575.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41706216061225 + 15809896059556 = 6458035^2 + 3976166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57516112120781 is a prime.

It is a super-2 number, since 2×57516112120781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57516112120771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28758056060390 + 28758056060391.

It is an arithmetic number, because the mean of its divisors is an integer number (28758056060391).

Almost surely, 2^{57516112120781} is an apocalyptic number.

It is an amenable number.

57516112120781 is a deficient number, since it is larger than the sum of its proper divisors (1).

57516112120781 is an equidigital number, since it uses as much as digits as its factorization.

57516112120781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 47.

The spelling of 57516112120781 in words is "fifty-seven trillion, five hundred sixteen billion, one hundred twelve million, one hundred twenty thousand, seven hundred eighty-one".