27801071117 has 2 divisors, whose sum is σ = 27801071118. Its totient is φ = 27801071116.

The previous prime is 27801071087. The next prime is 27801071153. The reversal of 27801071117 is 71117010872.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27335331556 + 465739561 = 165334^2 + 21581^2 .

It is a cyclic number.

It is not a de Polignac number, because 27801071117 - 2²⁰ = 27800022541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27801071167) 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, 13900535558 + 13900535559.

It is an arithmetic number, because the mean of its divisors is an integer number (13900535559).

Almost surely, 2^27801071117 is an apocalyptic number.

It is an amenable number.

27801071117 is a deficient number, since it is larger than the sum of its proper divisors (1).

27801071117 is an equidigital number, since it uses as much as digits as its factorization.

27801071117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5488, while the sum is 35.

Adding to 27801071117 its reverse (71117010872), we get a palindrome (98918081989).

The spelling of 27801071117 in words is "twenty-seven billion, eight hundred one million, seventy-one thousand, one hundred seventeen".