27728573161 has 2 divisors, whose sum is σ = 27728573162. Its totient is φ = 27728573160.

The previous prime is 27728573149. The next prime is 27728573207. The reversal of 27728573161 is 16137582772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24938726400 + 2789846761 = 157920^2 + 52819^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728573161 - 2¹⁵ = 27728540393 is a prime.

It is not a weakly prime, because it can be changed into another prime (27728583161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864286580 + 13864286581.

It is an arithmetic number, because the mean of its divisors is an integer number (13864286581).

Almost surely, 2^27728573161 is an apocalyptic number.

It is an amenable number.

27728573161 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728573161 is an equidigital number, since it uses as much as digits as its factorization.

27728573161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 49.

The spelling of 27728573161 in words is "twenty-seven billion, seven hundred twenty-eight million, five hundred seventy-three thousand, one hundred sixty-one".