57185609813 has 2 divisors, whose sum is σ = 57185609814. Its totient is φ = 57185609812.

The previous prime is 57185609809. The next prime is 57185609861. The reversal of 57185609813 is 31890658175.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44271105649 + 12914504164 = 210407^2 + 113642^2 .

It is a cyclic number.

It is not a de Polignac number, because 57185609813 - 2² = 57185609809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57185609213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28592804906 + 28592804907.

It is an arithmetic number, because the mean of its divisors is an integer number (28592804907).

Almost surely, 2^57185609813 is an apocalyptic number.

It is an amenable number.

57185609813 is a deficient number, since it is larger than the sum of its proper divisors (1).

57185609813 is an equidigital number, since it uses as much as digits as its factorization.

57185609813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 57185609813 in words is "fifty-seven billion, one hundred eighty-five million, six hundred nine thousand, eight hundred thirteen".