165221161066134 has 12 divisors (see below), whose sum is σ = 357979182309996. Its totient is φ = 55073720355372.

The previous prime is 165221161066079. The next prime is 165221161066187. The reversal of 165221161066134 is 431660161122561.

165221161066134 is a `hidden beast` number, since 1 + 6 + 5 + 2 + 2 + 1 + 16 + 10 + 6 + 613 + 4 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165221161066134.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4589476696264 + ... + 4589476696299.

It is an arithmetic number, because the mean of its divisors is an integer number (29831598525833).

Almost surely, 2^{165221161066134} is an apocalyptic number.

165221161066134 is an abundant number, since it is smaller than the sum of its proper divisors (192758021243862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165221161066134 is a wasteful number, since it uses less digits than its factorization.

165221161066134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9178953392571 (or 9178953392568 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 165221161066134 in words is "one hundred sixty-five trillion, two hundred twenty-one billion, one hundred sixty-one million, sixty-six thousand, one hundred thirty-four".