27747888317 has 2 divisors, whose sum is σ = 27747888318. Its totient is φ = 27747888316.

The previous prime is 27747888293. The next prime is 27747888319. The reversal of 27747888317 is 71388874772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26510678041 + 1237210276 = 162821^2 + 35174^2 .

It is a cyclic number.

It is not a de Polignac number, because 27747888317 - 2⁶ = 27747888253 is a prime.

Together with 27747888319, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27747888317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27747888319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13873944158 + 13873944159.

It is an arithmetic number, because the mean of its divisors is an integer number (13873944159).

Almost surely, 2^27747888317 is an apocalyptic number.

It is an amenable number.

27747888317 is a deficient number, since it is larger than the sum of its proper divisors (1).

27747888317 is an equidigital number, since it uses as much as digits as its factorization.

27747888317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29503488, while the sum is 62.

The spelling of 27747888317 in words is "twenty-seven billion, seven hundred forty-seven million, eight hundred eighty-eight thousand, three hundred seventeen".