27986022154861 has 2 divisors, whose sum is σ = 27986022154862. Its totient is φ = 27986022154860.

The previous prime is 27986022154859. The next prime is 27986022154879. The reversal of 27986022154861 is 16845122068972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27505766224836 + 480255930025 = 5244594^2 + 693005^2 .

It is a cyclic number.

It is not a de Polignac number, because 27986022154861 - 2¹ = 27986022154859 is a prime.

Together with 27986022154859, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 27986022154861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27986022151861) 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, 13993011077430 + 13993011077431.

It is an arithmetic number, because the mean of its divisors is an integer number (13993011077431).

Almost surely, 2^{27986022154861} is an apocalyptic number.

It is an amenable number.

27986022154861 is a deficient number, since it is larger than the sum of its proper divisors (1).

27986022154861 is an equidigital number, since it uses as much as digits as its factorization.

27986022154861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23224320, while the sum is 61.

The spelling of 27986022154861 in words is "twenty-seven trillion, nine hundred eighty-six billion, twenty-two million, one hundred fifty-four thousand, eight hundred sixty-one".