27855080581 has 2 divisors, whose sum is σ = 27855080582. Its totient is φ = 27855080580.

The previous prime is 27855080579. The next prime is 27855080653. The reversal of 27855080581 is 18508055872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26753836356 + 1101244225 = 163566^2 + 33185^2 .

It is a cyclic number.

It is not a de Polignac number, because 27855080581 - 2¹ = 27855080579 is a prime.

It is a super-2 number, since 2×27855080581² (a number of 22 digits) contains 22 as substring.

Together with 27855080579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27855080881) 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, 13927540290 + 13927540291.

It is an arithmetic number, because the mean of its divisors is an integer number (13927540291).

Almost surely, 2^27855080581 is an apocalyptic number.

It is an amenable number.

27855080581 is a deficient number, since it is larger than the sum of its proper divisors (1).

27855080581 is an equidigital number, since it uses as much as digits as its factorization.

27855080581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896000, while the sum is 49.

The spelling of 27855080581 in words is "twenty-seven billion, eight hundred fifty-five million, eighty thousand, five hundred eighty-one".