27717375689 has 2 divisors, whose sum is σ = 27717375690. Its totient is φ = 27717375688.

The previous prime is 27717375529. The next prime is 27717375797. The reversal of 27717375689 is 98657371772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23292864400 + 4424511289 = 152620^2 + 66517^2 .

It is a cyclic number.

It is not a de Polignac number, because 27717375689 - 2²⁰ = 27716327113 is a prime.

It is not a weakly prime, because it can be changed into another prime (27717375989) 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, 13858687844 + 13858687845.

It is an arithmetic number, because the mean of its divisors is an integer number (13858687845).

Almost surely, 2^27717375689 is an apocalyptic number.

It is an amenable number.

27717375689 is a deficient number, since it is larger than the sum of its proper divisors (1).

27717375689 is an equidigital number, since it uses as much as digits as its factorization.

27717375689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31116960, while the sum is 62.

The spelling of 27717375689 in words is "twenty-seven billion, seven hundred seventeen million, three hundred seventy-five thousand, six hundred eighty-nine".