57126587761 has 2 divisors, whose sum is σ = 57126587762. Its totient is φ = 57126587760.

The previous prime is 57126587759. The next prime is 57126587803. The reversal of 57126587761 is 16778562175.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54221916736 + 2904671025 = 232856^2 + 53895^2 .

It is a cyclic number.

It is not a de Polignac number, because 57126587761 - 2¹ = 57126587759 is a prime.

Together with 57126587759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (57126587731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28563293880 + 28563293881.

It is an arithmetic number, because the mean of its divisors is an integer number (28563293881).

Almost surely, 2^57126587761 is an apocalyptic number.

It is an amenable number.

57126587761 is a deficient number, since it is larger than the sum of its proper divisors (1).

57126587761 is an equidigital number, since it uses as much as digits as its factorization.

57126587761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4939200, while the sum is 55.

The spelling of 57126587761 in words is "fifty-seven billion, one hundred twenty-six million, five hundred eighty-seven thousand, seven hundred sixty-one".