27871947017 has 2 divisors, whose sum is σ = 27871947018. Its totient is φ = 27871947016.

The previous prime is 27871947013. The next prime is 27871947031. The reversal of 27871947017 is 71074917872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21954645241 + 5917301776 = 148171^2 + 76924^2 .

It is a cyclic number.

It is not a de Polignac number, because 27871947017 - 2² = 27871947013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27871947017.

It is not a weakly prime, because it can be changed into another prime (27871947013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13935973508 + 13935973509.

It is an arithmetic number, because the mean of its divisors is an integer number (13935973509).

Almost surely, 2^27871947017 is an apocalyptic number.

It is an amenable number.

27871947017 is a deficient number, since it is larger than the sum of its proper divisors (1).

27871947017 is an equidigital number, since it uses as much as digits as its factorization.

27871947017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1382976, while the sum is 53.

The spelling of 27871947017 in words is "twenty-seven billion, eight hundred seventy-one million, nine hundred forty-seven thousand, seventeen".