27660447709 has 2 divisors, whose sum is σ = 27660447710. Its totient is φ = 27660447708.

The previous prime is 27660447637. The next prime is 27660447721. The reversal of 27660447709 is 90774406672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17271742084 + 10388705625 = 131422^2 + 101925^2 .

It is a cyclic number.

It is not a de Polignac number, because 27660447709 - 2¹¹ = 27660445661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27660447799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13830223854 + 13830223855.

It is an arithmetic number, because the mean of its divisors is an integer number (13830223855).

Almost surely, 2^27660447709 is an apocalyptic number.

It is an amenable number.

27660447709 is a deficient number, since it is larger than the sum of its proper divisors (1).

27660447709 is an equidigital number, since it uses as much as digits as its factorization.

27660447709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3556224, while the sum is 52.

The spelling of 27660447709 in words is "twenty-seven billion, six hundred sixty million, four hundred forty-seven thousand, seven hundred nine".