27861121543 has 2 divisors, whose sum is σ = 27861121544. Its totient is φ = 27861121542.

The previous prime is 27861121531. The next prime is 27861121597. The reversal of 27861121543 is 34512116872.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27861121543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27861121496 and 27861121505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27861121843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13930560771 + 13930560772.

It is an arithmetic number, because the mean of its divisors is an integer number (13930560772).

Almost surely, 2^27861121543 is an apocalyptic number.

27861121543 is a deficient number, since it is larger than the sum of its proper divisors (1).

27861121543 is an equidigital number, since it uses as much as digits as its factorization.

27861121543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The spelling of 27861121543 in words is "twenty-seven billion, eight hundred sixty-one million, one hundred twenty-one thousand, five hundred forty-three".