1855769112173 has 2 divisors, whose sum is σ = 1855769112174. Its totient is φ = 1855769112172.

The previous prime is 1855769112139. The next prime is 1855769112181. The reversal of 1855769112173 is 3712119675581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1402230168964 + 453538943209 = 1184158^2 + 673453^2 .

It is an emirp because it is prime and its reverse (3712119675581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1855769112173 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 (1855769112103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927884556086 + 927884556087.

It is an arithmetic number, because the mean of its divisors is an integer number (927884556087).

Almost surely, 2^{1855769112173} is an apocalyptic number.

It is an amenable number.

1855769112173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855769112173 is an equidigital number, since it uses as much as digits as its factorization.

1855769112173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3175200, while the sum is 56.

The spelling of 1855769112173 in words is "one trillion, eight hundred fifty-five billion, seven hundred sixty-nine million, one hundred twelve thousand, one hundred seventy-three".