28271556161 has 2 divisors, whose sum is σ = 28271556162. Its totient is φ = 28271556160.

The previous prime is 28271556091. The next prime is 28271556241. The reversal of 28271556161 is 16165517282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15976960000 + 12294596161 = 126400^2 + 110881^2 .

It is a cyclic number.

It is not a de Polignac number, because 28271556161 - 2³⁰ = 27197814337 is a prime.

It is not a weakly prime, because it can be changed into another prime (28271550161) 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, 14135778080 + 14135778081.

It is an arithmetic number, because the mean of its divisors is an integer number (14135778081).

Almost surely, 2^28271556161 is an apocalyptic number.

It is an amenable number.

28271556161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28271556161 is an equidigital number, since it uses as much as digits as its factorization.

28271556161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 44.

The spelling of 28271556161 in words is "twenty-eight billion, two hundred seventy-one million, five hundred fifty-six thousand, one hundred sixty-one".