28166940504089 has 2 divisors, whose sum is σ = 28166940504090. Its totient is φ = 28166940504088.

The previous prime is 28166940503971. The next prime is 28166940504113. The reversal of 28166940504089 is 98040504966182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28044258436489 + 122682067600 = 5295683^2 + 350260^2 .

It is a cyclic number.

It is not a de Polignac number, because 28166940504089 - 2⁴⁴ = 10574754459673 is a prime.

It is not a weakly prime, because it can be changed into another prime (28166940503089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14083470252044 + 14083470252045.

It is an arithmetic number, because the mean of its divisors is an integer number (14083470252045).

Almost surely, 2^{28166940504089} is an apocalyptic number.

It is an amenable number.

28166940504089 is a deficient number, since it is larger than the sum of its proper divisors (1).

28166940504089 is an equidigital number, since it uses as much as digits as its factorization.

28166940504089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29859840, while the sum is 62.

The spelling of 28166940504089 in words is "twenty-eight trillion, one hundred sixty-six billion, nine hundred forty million, five hundred four thousand, eighty-nine".