57851855821 has 2 divisors, whose sum is σ = 57851855822. Its totient is φ = 57851855820.

The previous prime is 57851855777. The next prime is 57851855837. The reversal of 57851855821 is 12855815875.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57501642025 + 350213796 = 239795^2 + 18714^2 .

It is a cyclic number.

It is not a de Polignac number, because 57851855821 - 2¹⁵ = 57851823053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57851655821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28925927910 + 28925927911.

It is an arithmetic number, because the mean of its divisors is an integer number (28925927911).

Almost surely, 2^57851855821 is an apocalyptic number.

It is an amenable number.

57851855821 is a deficient number, since it is larger than the sum of its proper divisors (1).

57851855821 is an equidigital number, since it uses as much as digits as its factorization.

57851855821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4480000, while the sum is 55.

The spelling of 57851855821 in words is "fifty-seven billion, eight hundred fifty-one million, eight hundred fifty-five thousand, eight hundred twenty-one".