162111722161 has 3 divisors (see below), whose sum is σ = 162112124793. Its totient is φ = 162111319530.

The previous prime is 162111722147. The next prime is 162111722173. The reversal of 162111722161 is 161227111261.

It is a happy number.

The square root of 162111722161 is 402631.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 162111722161 - 2³³ = 153521787569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162111702161) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 201316 + ... + 603946.

It is an arithmetic number, because the mean of its divisors is an integer number (54037374931).

Almost surely, 2^162111722161 is an apocalyptic number.

162111722161 is the 402631-st square number.

162111722161 is the 201316-th centered octagonal number.

It is an amenable number.

162111722161 is a deficient number, since it is larger than the sum of its proper divisors (402632).

162111722161 is an frugal number, since it uses more digits than its factorization.

162111722161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805262 (or 402631 counting only the distinct ones).

The product of its digits is 2016, while the sum is 31.

The spelling of 162111722161 in words is "one hundred sixty-two billion, one hundred eleven million, seven hundred twenty-two thousand, one hundred sixty-one".