161745858828173 has 2 divisors, whose sum is σ = 161745858828174. Its totient is φ = 161745858828172.

The previous prime is 161745858828133. The next prime is 161745858828233. The reversal of 161745858828173 is 371828858547161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92742716611204 + 69003142216969 = 9630302^2 + 8306813^2 .

It is a cyclic number.

It is not a de Polignac number, because 161745858828173 - 2³⁰ = 161744785086349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161745858828173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161745858828133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80872929414086 + 80872929414087.

It is an arithmetic number, because the mean of its divisors is an integer number (80872929414087).

Almost surely, 2^{161745858828173} is an apocalyptic number.

It is an amenable number.

161745858828173 is a deficient number, since it is larger than the sum of its proper divisors (1).

161745858828173 is an equidigital number, since it uses as much as digits as its factorization.

161745858828173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 722534400, while the sum is 74.

The spelling of 161745858828173 in words is "one hundred sixty-one trillion, seven hundred forty-five billion, eight hundred fifty-eight million, eight hundred twenty-eight thousand, one hundred seventy-three".