27505555009 has 2 divisors, whose sum is σ = 27505555010. Its totient is φ = 27505555008.

The previous prime is 27505554961. The next prime is 27505555019. The reversal of 27505555009 is 90055550572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17390224384 + 10115330625 = 131872^2 + 100575^2 .

It is a cyclic number.

It is not a de Polignac number, because 27505555009 - 2¹⁷ = 27505423937 is a prime.

It is not a weakly prime, because it can be changed into another prime (27505555019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13752777504 + 13752777505.

It is an arithmetic number, because the mean of its divisors is an integer number (13752777505).

Almost surely, 2^27505555009 is an apocalyptic number.

It is an amenable number.

27505555009 is a deficient number, since it is larger than the sum of its proper divisors (1).

27505555009 is an equidigital number, since it uses as much as digits as its factorization.

27505555009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 393750, while the sum is 43.

The spelling of 27505555009 in words is "twenty-seven billion, five hundred five million, five hundred fifty-five thousand, nine".