165221161065683 has 16 divisors (see below), whose sum is σ = 171051769908000. Its totient is φ = 159466794999552.

The previous prime is 165221161065659. The next prime is 165221161065691. The reversal of 165221161065683 is 386560161122561.

It is a cyclic number.

It is not a de Polignac number, because 165221161065683 - 2²⁰ = 165221160017107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165221161065643) 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, 27788228 + ... + 33205841.

It is an arithmetic number, because the mean of its divisors is an integer number (10690735619250).

Almost surely, 2^{165221161065683} is an apocalyptic number.

165221161065683 is a deficient number, since it is larger than the sum of its proper divisors (5830608842317).

165221161065683 is a wasteful number, since it uses less digits than its factorization.

165221161065683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60994694.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 165221161065683 in words is "one hundred sixty-five trillion, two hundred twenty-one billion, one hundred sixty-one million, sixty-five thousand, six hundred eighty-three".