27689856613 has 2 divisors, whose sum is σ = 27689856614. Its totient is φ = 27689856612.

The previous prime is 27689856563. The next prime is 27689856619. The reversal of 27689856613 is 31665898672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14538812929 + 13151043684 = 120577^2 + 114678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27689856613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27689856619) 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, 13844928306 + 13844928307.

It is an arithmetic number, because the mean of its divisors is an integer number (13844928307).

Almost surely, 2^27689856613 is an apocalyptic number.

It is an amenable number.

27689856613 is a deficient number, since it is larger than the sum of its proper divisors (1).

27689856613 is an equidigital number, since it uses as much as digits as its factorization.

27689856613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 61.

The spelling of 27689856613 in words is "twenty-seven billion, six hundred eighty-nine million, eight hundred fifty-six thousand, six hundred thirteen".