27745564909 has 2 divisors, whose sum is σ = 27745564910. Its totient is φ = 27745564908.

The previous prime is 27745564883. The next prime is 27745564927. The reversal of 27745564909 is 90946554772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27745564900 + 9 = 166570^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 27745564909 - 2³³ = 19155630317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27745564409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13872782454 + 13872782455.

It is an arithmetic number, because the mean of its divisors is an integer number (13872782455).

Almost surely, 2^27745564909 is an apocalyptic number.

It is an amenable number.

27745564909 is a deficient number, since it is larger than the sum of its proper divisors (1).

27745564909 is an equidigital number, since it uses as much as digits as its factorization.

27745564909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19051200, while the sum is 58.

The spelling of 27745564909 in words is "twenty-seven billion, seven hundred forty-five million, five hundred sixty-four thousand, nine hundred nine".