165043543496861 has 2 divisors, whose sum is σ = 165043543496862. Its totient is φ = 165043543496860.

The previous prime is 165043543496813. The next prime is 165043543496869. The reversal of 165043543496861 is 168694345340561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146174024160025 + 18869519336836 = 12090245^2 + 4343906^2 .

It is a cyclic number.

It is not a de Polignac number, because 165043543496861 - 2¹⁴ = 165043543480477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165043543496869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82521771748430 + 82521771748431.

It is an arithmetic number, because the mean of its divisors is an integer number (82521771748431).

Almost surely, 2^{165043543496861} is an apocalyptic number.

It is an amenable number.

165043543496861 is a deficient number, since it is larger than the sum of its proper divisors (1).

165043543496861 is an equidigital number, since it uses as much as digits as its factorization.

165043543496861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 223948800, while the sum is 65.

The spelling of 165043543496861 in words is "one hundred sixty-five trillion, forty-three billion, five hundred forty-three million, four hundred ninety-six thousand, eight hundred sixty-one".