27768384247 has 2 divisors, whose sum is σ = 27768384248. Its totient is φ = 27768384246.

The previous prime is 27768384221. The next prime is 27768384251. The reversal of 27768384247 is 74248386772.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27768384247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27768384191 and 27768384200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27768384257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13884192123 + 13884192124.

It is an arithmetic number, because the mean of its divisors is an integer number (13884192124).

Almost surely, 2^27768384247 is an apocalyptic number.

27768384247 is a deficient number, since it is larger than the sum of its proper divisors (1).

27768384247 is an equidigital number, since it uses as much as digits as its factorization.

27768384247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25288704, while the sum is 58.

The spelling of 27768384247 in words is "twenty-seven billion, seven hundred sixty-eight million, three hundred eighty-four thousand, two hundred forty-seven".