27685657277 has 2 divisors, whose sum is σ = 27685657278. Its totient is φ = 27685657276.

The previous prime is 27685657249. The next prime is 27685657367. The reversal of 27685657277 is 77275658672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18739145881 + 8946511396 = 136891^2 + 94586^2 .

It is a cyclic number.

It is not a de Polignac number, because 27685657277 - 2¹⁴ = 27685640893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27685657247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13842828638 + 13842828639.

It is an arithmetic number, because the mean of its divisors is an integer number (13842828639).

Almost surely, 2^27685657277 is an apocalyptic number.

It is an amenable number.

27685657277 is a deficient number, since it is larger than the sum of its proper divisors (1).

27685657277 is an equidigital number, since it uses as much as digits as its factorization.

27685657277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69148800, while the sum is 62.

The spelling of 27685657277 in words is "twenty-seven billion, six hundred eighty-five million, six hundred fifty-seven thousand, two hundred seventy-seven".