27307780909 has 2 divisors, whose sum is σ = 27307780910. Its totient is φ = 27307780908.

The previous prime is 27307780859. The next prime is 27307780931. The reversal of 27307780909 is 90908770372.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27276174025 + 31606884 = 165155^2 + 5622^2 .

It is a cyclic number.

It is not a de Polignac number, because 27307780909 - 2⁹ = 27307780397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27307780979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13653890454 + 13653890455.

It is an arithmetic number, because the mean of its divisors is an integer number (13653890455).

Almost surely, 2^27307780909 is an apocalyptic number.

It is an amenable number.

27307780909 is a deficient number, since it is larger than the sum of its proper divisors (1).

27307780909 is an equidigital number, since it uses as much as digits as its factorization.

27307780909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1333584, while the sum is 52.

The spelling of 27307780909 in words is "twenty-seven billion, three hundred seven million, seven hundred eighty thousand, nine hundred nine".