165171112221171 has 32 divisors (see below), whose sum is σ = 255449163087360. Its totient is φ = 92973585551616.

The previous prime is 165171112221139. The next prime is 165171112221173. The reversal of 165171112221171 is 171122211171561.

It is not a de Polignac number, because 165171112221171 - 2⁵ = 165171112221139 is a prime.

It is a super-2 number, since 2×165171112221171² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165171112221173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114710575 + ... + 116141543.

It is an arithmetic number, because the mean of its divisors is an integer number (7982786346480).

Almost surely, 2^{165171112221171} is an apocalyptic number.

165171112221171 is a deficient number, since it is larger than the sum of its proper divisors (90278050866189).

165171112221171 is a wasteful number, since it uses less digits than its factorization.

165171112221171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513083.

The product of its digits is 11760, while the sum is 39.

The spelling of 165171112221171 in words is "one hundred sixty-five trillion, one hundred seventy-one billion, one hundred twelve million, two hundred twenty-one thousand, one hundred seventy-one".