27386816309 has 2 divisors, whose sum is σ = 27386816310. Its totient is φ = 27386816308.

The previous prime is 27386816287. The next prime is 27386816323. The reversal of 27386816309 is 90361868372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16532302084 + 10854514225 = 128578^2 + 104185^2 .

It is a cyclic number.

It is not a de Polignac number, because 27386816309 - 2⁸ = 27386816053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27386816329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13693408154 + 13693408155.

It is an arithmetic number, because the mean of its divisors is an integer number (13693408155).

Almost surely, 2^27386816309 is an apocalyptic number.

It is an amenable number.

27386816309 is a deficient number, since it is larger than the sum of its proper divisors (1).

27386816309 is an equidigital number, since it uses as much as digits as its factorization.

27386816309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 27386816309 in words is "twenty-seven billion, three hundred eighty-six million, eight hundred sixteen thousand, three hundred nine".