57985544521 has 2 divisors, whose sum is σ = 57985544522. Its totient is φ = 57985544520.

The previous prime is 57985544447. The next prime is 57985544527. The reversal of 57985544521 is 12544558975.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44939336121 + 13046208400 = 211989^2 + 114220^2 .

It is a cyclic number.

It is not a de Polignac number, because 57985544521 - 2⁹ = 57985544009 is a prime.

It is not a weakly prime, because it can be changed into another prime (57985544527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28992772260 + 28992772261.

It is an arithmetic number, because the mean of its divisors is an integer number (28992772261).

Almost surely, 2^57985544521 is an apocalyptic number.

It is an amenable number.

57985544521 is a deficient number, since it is larger than the sum of its proper divisors (1).

57985544521 is an equidigital number, since it uses as much as digits as its factorization.

57985544521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080000, while the sum is 55.

The spelling of 57985544521 in words is "fifty-seven billion, nine hundred eighty-five million, five hundred forty-four thousand, five hundred twenty-one".