52558557581 has 2 divisors, whose sum is σ = 52558557582. Its totient is φ = 52558557580.

The previous prime is 52558557559. The next prime is 52558557619. The reversal of 52558557581 is 18575585525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30740608900 + 21817948681 = 175330^2 + 147709^2 .

It is a cyclic number.

It is not a de Polignac number, because 52558557581 - 2¹⁸ = 52558295437 is a prime.

It is a super-2 number, since 2×52558557581² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52558557281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26279278790 + 26279278791.

It is an arithmetic number, because the mean of its divisors is an integer number (26279278791).

Almost surely, 2^52558557581 is an apocalyptic number.

It is an amenable number.

52558557581 is a deficient number, since it is larger than the sum of its proper divisors (1).

52558557581 is an equidigital number, since it uses as much as digits as its factorization.

52558557581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14000000, while the sum is 56.

The spelling of 52558557581 in words is "fifty-two billion, five hundred fifty-eight million, five hundred fifty-seven thousand, five hundred eighty-one".