27689243377 has 2 divisors, whose sum is σ = 27689243378. Its totient is φ = 27689243376.

The previous prime is 27689243333. The next prime is 27689243401. The reversal of 27689243377 is 77334298672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21399008656 + 6290234721 = 146284^2 + 79311^2 .

It is a cyclic number.

It is not a de Polignac number, because 27689243377 - 2²⁷ = 27555025649 is a prime.

It is not a weakly prime, because it can be changed into another prime (27689243327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13844621688 + 13844621689.

It is an arithmetic number, because the mean of its divisors is an integer number (13844621689).

Almost surely, 2^27689243377 is an apocalyptic number.

It is an amenable number.

27689243377 is a deficient number, since it is larger than the sum of its proper divisors (1).

27689243377 is an equidigital number, since it uses as much as digits as its factorization.

27689243377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21337344, while the sum is 58.

The spelling of 27689243377 in words is "twenty-seven billion, six hundred eighty-nine million, two hundred forty-three thousand, three hundred seventy-seven".