28173027161 has 2 divisors, whose sum is σ = 28173027162. Its totient is φ = 28173027160.

The previous prime is 28173027149. The next prime is 28173027247. The reversal of 28173027161 is 16172037182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24638011225 + 3535015936 = 156965^2 + 59456^2 .

It is a cyclic number.

It is not a de Polignac number, because 28173027161 - 2¹⁸ = 28172765017 is a prime.

It is not a weakly prime, because it can be changed into another prime (28173027101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14086513580 + 14086513581.

It is an arithmetic number, because the mean of its divisors is an integer number (14086513581).

Almost surely, 2^28173027161 is an apocalyptic number.

It is an amenable number.

28173027161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28173027161 is an equidigital number, since it uses as much as digits as its factorization.

28173027161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 38.

The spelling of 28173027161 in words is "twenty-eight billion, one hundred seventy-three million, twenty-seven thousand, one hundred sixty-one".