27013382581 has 2 divisors, whose sum is σ = 27013382582. Its totient is φ = 27013382580.

The previous prime is 27013382573. The next prime is 27013382593. The reversal of 27013382581 is 18528331072.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20486196900 + 6527185681 = 143130^2 + 80791^2 .

It is a cyclic number.

It is not a de Polignac number, because 27013382581 - 2³ = 27013382573 is a prime.

It is a super-2 number, since 2×27013382581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27013382881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13506691290 + 13506691291.

It is an arithmetic number, because the mean of its divisors is an integer number (13506691291).

Almost surely, 2^27013382581 is an apocalyptic number.

It is an amenable number.

27013382581 is a deficient number, since it is larger than the sum of its proper divisors (1).

27013382581 is an equidigital number, since it uses as much as digits as its factorization.

27013382581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 27013382581 in words is "twenty-seven billion, thirteen million, three hundred eighty-two thousand, five hundred eighty-one".