27866161781543 has 2 divisors, whose sum is σ = 27866161781544. Its totient is φ = 27866161781542.

The previous prime is 27866161781473. The next prime is 27866161781551. The reversal of 27866161781543 is 34518716166872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27866161781543 - 2²⁰ = 27866160732967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27866161781543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27866161780543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13933080890771 + 13933080890772.

It is an arithmetic number, because the mean of its divisors is an integer number (13933080890772).

Almost surely, 2^{27866161781543} is an apocalyptic number.

27866161781543 is a deficient number, since it is larger than the sum of its proper divisors (1).

27866161781543 is an equidigital number, since it uses as much as digits as its factorization.

27866161781543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81285120, while the sum is 65.

The spelling of 27866161781543 in words is "twenty-seven trillion, eight hundred sixty-six billion, one hundred sixty-one million, seven hundred eighty-one thousand, five hundred forty-three".