165561261163343 has 16 divisors (see below), whose sum is σ = 167852042781696. Its totient is φ = 163284374652960.

The previous prime is 165561261163283. The next prime is 165561261163439. The reversal of 165561261163343 is 343361162165561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165561261163343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165561261168343) 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 in 15 ways as a sum of consecutive naturals, for example, 43031528 + ... + 46720818.

It is an arithmetic number, because the mean of its divisors is an integer number (10490752673856).

Almost surely, 2^{165561261163343} is an apocalyptic number.

165561261163343 is a deficient number, since it is larger than the sum of its proper divisors (2290781618353).

165561261163343 is a wasteful number, since it uses less digits than its factorization.

165561261163343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691174.

The product of its digits is 6998400, while the sum is 53.

The spelling of 165561261163343 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, two hundred sixty-one million, one hundred sixty-three thousand, three hundred forty-three".