171940775194049 has 2 divisors, whose sum is σ = 171940775194050. Its totient is φ = 171940775194048.

The previous prime is 171940775193983. The next prime is 171940775194061. The reversal of 171940775194049 is 940491577049171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171938836377025 + 1938817024 = 13112545^2 + 44032^2 .

It is a cyclic number.

It is not a de Polignac number, because 171940775194049 - 2²⁰ = 171940774145473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 171940775194049.

It is not a weakly prime, because it can be changed into another prime (171940775194649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85970387597024 + 85970387597025.

It is an arithmetic number, because the mean of its divisors is an integer number (85970387597025).

Almost surely, 2^{171940775194049} is an apocalyptic number.

It is an amenable number.

171940775194049 is a deficient number, since it is larger than the sum of its proper divisors (1).

171940775194049 is an equidigital number, since it uses as much as digits as its factorization.

171940775194049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80015040, while the sum is 68.

The spelling of 171940775194049 in words is "one hundred seventy-one trillion, nine hundred forty billion, seven hundred seventy-five million, one hundred ninety-four thousand, forty-nine".