165156550560173 has 2 divisors, whose sum is σ = 165156550560174. Its totient is φ = 165156550560172.

The previous prime is 165156550560143. The next prime is 165156550560217. The reversal of 165156550560173 is 371065055651561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110367568326409 + 54788982233764 = 10505597^2 + 7401958^2 .

It is a cyclic number.

It is not a de Polignac number, because 165156550560173 - 2¹⁰ = 165156550559149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165156550560143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82578275280086 + 82578275280087.

It is an arithmetic number, because the mean of its divisors is an integer number (82578275280087).

Almost surely, 2^{165156550560173} is an apocalyptic number.

It is an amenable number.

165156550560173 is a deficient number, since it is larger than the sum of its proper divisors (1).

165156550560173 is an equidigital number, since it uses as much as digits as its factorization.

165156550560173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14175000, while the sum is 56.

The spelling of 165156550560173 in words is "one hundred sixty-five trillion, one hundred fifty-six billion, five hundred fifty million, five hundred sixty thousand, one hundred seventy-three".