27279257609 has 2 divisors, whose sum is σ = 27279257610. Its totient is φ = 27279257608.

The previous prime is 27279257539. The next prime is 27279257611. The reversal of 27279257609 is 90675297272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27183765625 + 95491984 = 164875^2 + 9772^2 .

It is a cyclic number.

It is not a de Polignac number, because 27279257609 - 2¹² = 27279253513 is a prime.

Together with 27279257611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27279257669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13639628804 + 13639628805.

It is an arithmetic number, because the mean of its divisors is an integer number (13639628805).

Almost surely, 2^27279257609 is an apocalyptic number.

It is an amenable number.

27279257609 is a deficient number, since it is larger than the sum of its proper divisors (1).

27279257609 is an equidigital number, since it uses as much as digits as its factorization.

27279257609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6667920, while the sum is 56.

The spelling of 27279257609 in words is "twenty-seven billion, two hundred seventy-nine million, two hundred fifty-seven thousand, six hundred nine".