27756566763449 has 2 divisors, whose sum is σ = 27756566763450. Its totient is φ = 27756566763448.

The previous prime is 27756566763437. The next prime is 27756566763451. The reversal of 27756566763449 is 94436766565772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23389168975225 + 4367397788224 = 4836235^2 + 2089832^2 .

It is a cyclic number.

It is not a de Polignac number, because 27756566763449 - 2⁸ = 27756566763193 is a prime.

It is a Sophie Germain prime.

Together with 27756566763451, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27756566763449.

It is not a weakly prime, because it can be changed into another prime (27756566763469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13878283381724 + 13878283381725.

It is an arithmetic number, because the mean of its divisors is an integer number (13878283381725).

Almost surely, 2^{27756566763449} is an apocalyptic number.

It is an amenable number.

27756566763449 is a deficient number, since it is larger than the sum of its proper divisors (1).

27756566763449 is an equidigital number, since it uses as much as digits as its factorization.

27756566763449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9601804800, while the sum is 77.

The spelling of 27756566763449 in words is "twenty-seven trillion, seven hundred fifty-six billion, five hundred sixty-six million, seven hundred sixty-three thousand, four hundred forty-nine".