57447306362821 has 2 divisors, whose sum is σ = 57447306362822. Its totient is φ = 57447306362820.

The previous prime is 57447306362783. The next prime is 57447306362839. The reversal of 57447306362821 is 12826360374475.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53228332850625 + 4218973512196 = 7295775^2 + 2054014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57447306362821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57447306162821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28723653181410 + 28723653181411.

It is an arithmetic number, because the mean of its divisors is an integer number (28723653181411).

Almost surely, 2^{57447306362821} is an apocalyptic number.

It is an amenable number.

57447306362821 is a deficient number, since it is larger than the sum of its proper divisors (1).

57447306362821 is an equidigital number, since it uses as much as digits as its factorization.

57447306362821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40642560, while the sum is 58.

The spelling of 57447306362821 in words is "fifty-seven trillion, four hundred forty-seven billion, three hundred six million, three hundred sixty-two thousand, eight hundred twenty-one".