1155805185173 has 2 divisors, whose sum is σ = 1155805185174. Its totient is φ = 1155805185172.

The previous prime is 1155805185137. The next prime is 1155805185217. The reversal of 1155805185173 is 3715815085511.

Together with previous prime (1155805185137) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155317570449 + 487614724 = 1074857^2 + 22082^2 .

It is an emirp because it is prime and its reverse (3715815085511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155805185173 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155805185103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577902592586 + 577902592587.

It is an arithmetic number, because the mean of its divisors is an integer number (577902592587).

Almost surely, 2^{1155805185173} is an apocalyptic number.

It is an amenable number.

1155805185173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155805185173 is an equidigital number, since it uses as much as digits as its factorization.

1155805185173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840000, while the sum is 50.

The spelling of 1155805185173 in words is "one trillion, one hundred fifty-five billion, eight hundred five million, one hundred eighty-five thousand, one hundred seventy-three".