27866161780543 has 2 divisors, whose sum is σ = 27866161780544. Its totient is φ = 27866161780542.

The previous prime is 27866161780517. The next prime is 27866161780549. The reversal of 27866161780543 is 34508716166872.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27866161780543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27866161780549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13933080890271 + 13933080890272.

It is an arithmetic number, because the mean of its divisors is an integer number (13933080890272).

Almost surely, 2^{27866161780543} is an apocalyptic number.

27866161780543 is a deficient number, since it is larger than the sum of its proper divisors (1).

27866161780543 is an equidigital number, since it uses as much as digits as its factorization.

27866161780543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81285120, while the sum is 64.

The spelling of 27866161780543 in words is "twenty-seven trillion, eight hundred sixty-six billion, one hundred sixty-one million, seven hundred eighty thousand, five hundred forty-three".