27861120517 has 2 divisors, whose sum is σ = 27861120518. Its totient is φ = 27861120516.

The previous prime is 27861120493. The next prime is 27861120523. The reversal of 27861120517 is 71502116872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20705483236 + 7155637281 = 143894^2 + 84591^2 .

It is a cyclic number.

It is not a de Polignac number, because 27861120517 - 2¹¹ = 27861118469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27861120517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27861120527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13930560258 + 13930560259.

It is an arithmetic number, because the mean of its divisors is an integer number (13930560259).

Almost surely, 2^27861120517 is an apocalyptic number.

It is an amenable number.

27861120517 is a deficient number, since it is larger than the sum of its proper divisors (1).

27861120517 is an equidigital number, since it uses as much as digits as its factorization.

27861120517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 40.

The spelling of 27861120517 in words is "twenty-seven billion, eight hundred sixty-one million, one hundred twenty thousand, five hundred seventeen".