27449678891 has 2 divisors, whose sum is σ = 27449678892. Its totient is φ = 27449678890.

The previous prime is 27449678869. The next prime is 27449678897. The reversal of 27449678891 is 19887694472.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27449678891 - 2¹⁰ = 27449677867 is a prime.

It is not a weakly prime, because it can be changed into another prime (27449678897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13724839445 + 13724839446.

It is an arithmetic number, because the mean of its divisors is an integer number (13724839446).

Almost surely, 2^27449678891 is an apocalyptic number.

27449678891 is a deficient number, since it is larger than the sum of its proper divisors (1).

27449678891 is an equidigital number, since it uses as much as digits as its factorization.

27449678891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48771072, while the sum is 65.

The spelling of 27449678891 in words is "twenty-seven billion, four hundred forty-nine million, six hundred seventy-eight thousand, eight hundred ninety-one".