28643555163161 has 2 divisors, whose sum is σ = 28643555163162. Its totient is φ = 28643555163160.

The previous prime is 28643555163143. The next prime is 28643555163187. The reversal of 28643555163161 is 16136155534682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25274700486025 + 3368854677136 = 5027395^2 + 1835444^2 .

It is a cyclic number.

It is not a de Polignac number, because 28643555163161 - 2¹⁰ = 28643555162137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28643555163097 and 28643555163106.

It is not a weakly prime, because it can be changed into another prime (28643555163131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14321777581580 + 14321777581581.

It is an arithmetic number, because the mean of its divisors is an integer number (14321777581581).

Almost surely, 2^{28643555163161} is an apocalyptic number.

It is an amenable number.

28643555163161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28643555163161 is an equidigital number, since it uses as much as digits as its factorization.

28643555163161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552000, while the sum is 56.

The spelling of 28643555163161 in words is "twenty-eight trillion, six hundred forty-three billion, five hundred fifty-five million, one hundred sixty-three thousand, one hundred sixty-one".