57947868521 has 2 divisors, whose sum is σ = 57947868522. Its totient is φ = 57947868520.

The previous prime is 57947868509. The next prime is 57947868551. The reversal of 57947868521 is 12586874975.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29656628521 + 28291240000 = 172211^2 + 168200^2 .

It is a cyclic number.

It is not a de Polignac number, because 57947868521 - 2⁶ = 57947868457 is a prime.

It is a super-2 number, since 2×57947868521² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (57947868551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28973934260 + 28973934261.

It is an arithmetic number, because the mean of its divisors is an integer number (28973934261).

Almost surely, 2^57947868521 is an apocalyptic number.

It is an amenable number.

57947868521 is a deficient number, since it is larger than the sum of its proper divisors (1).

57947868521 is an equidigital number, since it uses as much as digits as its factorization.

57947868521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33868800, while the sum is 62.

The spelling of 57947868521 in words is "fifty-seven billion, nine hundred forty-seven million, eight hundred sixty-eight thousand, five hundred twenty-one".