57185609861 has 2 divisors, whose sum is σ = 57185609862. Its totient is φ = 57185609860.

The previous prime is 57185609813. The next prime is 57185609891. The reversal of 57185609861 is 16890658175.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45542120836 + 11643489025 = 213406^2 + 107905^2 .

It is a cyclic number.

It is not a de Polignac number, because 57185609861 - 2⁶ = 57185609797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 57185609797 and 57185609806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57185609891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28592804930 + 28592804931.

It is an arithmetic number, because the mean of its divisors is an integer number (28592804931).

Almost surely, 2^57185609861 is an apocalyptic number.

It is an amenable number.

57185609861 is a deficient number, since it is larger than the sum of its proper divisors (1).

57185609861 is an equidigital number, since it uses as much as digits as its factorization.

57185609861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 56.

The spelling of 57185609861 in words is "fifty-seven billion, one hundred eighty-five million, six hundred nine thousand, eight hundred sixty-one".