165561261168343 has 2 divisors, whose sum is σ = 165561261168344. Its totient is φ = 165561261168342.

The previous prime is 165561261168299. The next prime is 165561261168377. The reversal of 165561261168343 is 343861162165561.

It is a strong prime.

It is an emirp because it is prime and its reverse (343861162165561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165561261168343 - 2³³ = 165552671233751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165561261168383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82780630584171 + 82780630584172.

It is an arithmetic number, because the mean of its divisors is an integer number (82780630584172).

Almost surely, 2^{165561261168343} is an apocalyptic number.

165561261168343 is a deficient number, since it is larger than the sum of its proper divisors (1).

165561261168343 is an equidigital number, since it uses as much as digits as its factorization.

165561261168343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18662400, while the sum is 58.

The spelling of 165561261168343 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, two hundred sixty-one million, one hundred sixty-eight thousand, three hundred forty-three".