2011643178173 has 2 divisors, whose sum is σ = 2011643178174. Its totient is φ = 2011643178172.

The previous prime is 2011643178163. The next prime is 2011643178247. The reversal of 2011643178173 is 3718713461102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1262166865444 + 749476312729 = 1123462^2 + 865723^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011643178173 - 2²⁴ = 2011626400957 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 (2011643178143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005821589086 + 1005821589087.

It is an arithmetic number, because the mean of its divisors is an integer number (1005821589087).

Almost surely, 2^{2011643178173} is an apocalyptic number.

It is an amenable number.

2011643178173 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011643178173 is an equidigital number, since it uses as much as digits as its factorization.

2011643178173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 2011643178173 in words is "two trillion, eleven billion, six hundred forty-three million, one hundred seventy-eight thousand, one hundred seventy-three".