27986043061 has 2 divisors, whose sum is σ = 27986043062. Its totient is φ = 27986043060.

The previous prime is 27986042977. The next prime is 27986043077. The reversal of 27986043061 is 16034068972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22485002500 + 5501040561 = 149950^2 + 74169^2 .

It is a cyclic number.

It is not a de Polignac number, because 27986043061 - 2¹⁵ = 27986010293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27986044061) 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, 13993021530 + 13993021531.

It is an arithmetic number, because the mean of its divisors is an integer number (13993021531).

Almost surely, 2^27986043061 is an apocalyptic number.

It is an amenable number.

27986043061 is a deficient number, since it is larger than the sum of its proper divisors (1).

27986043061 is an equidigital number, since it uses as much as digits as its factorization.

27986043061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 27986043061 in words is "twenty-seven billion, nine hundred eighty-six million, forty-three thousand, sixty-one".