27959691589 has 2 divisors, whose sum is σ = 27959691590. Its totient is φ = 27959691588.

The previous prime is 27959691581. The next prime is 27959691607. The reversal of 27959691589 is 98519695972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27934108225 + 25583364 = 167135^2 + 5058^2 .

It is a cyclic number.

It is not a de Polignac number, because 27959691589 - 2³ = 27959691581 is a prime.

It is a super-4 number, since 4×27959691589⁴ (a number of 43 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27959691581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13979845794 + 13979845795.

It is an arithmetic number, because the mean of its divisors is an integer number (13979845795).

Almost surely, 2^27959691589 is an apocalyptic number.

It is an amenable number.

27959691589 is a deficient number, since it is larger than the sum of its proper divisors (1).

27959691589 is an equidigital number, since it uses as much as digits as its factorization.

27959691589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110224800, while the sum is 70.

The spelling of 27959691589 in words is "twenty-seven billion, nine hundred fifty-nine million, six hundred ninety-one thousand, five hundred eighty-nine".