27687837857 has 2 divisors, whose sum is σ = 27687837858. Its totient is φ = 27687837856.

The previous prime is 27687837811. The next prime is 27687837869. The reversal of 27687837857 is 75873878672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27124772416 + 563065441 = 164696^2 + 23729^2 .

It is a cyclic number.

It is not a de Polignac number, because 27687837857 - 2⁸ = 27687837601 is a prime.

It is not a weakly prime, because it can be changed into another prime (27687837887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13843918928 + 13843918929.

It is an arithmetic number, because the mean of its divisors is an integer number (13843918929).

Almost surely, 2^27687837857 is an apocalyptic number.

It is an amenable number.

27687837857 is a deficient number, since it is larger than the sum of its proper divisors (1).

27687837857 is an equidigital number, since it uses as much as digits as its factorization.

27687837857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221276160, while the sum is 68.

The spelling of 27687837857 in words is "twenty-seven billion, six hundred eighty-seven million, eight hundred thirty-seven thousand, eight hundred fifty-seven".