161600665016165 has 8 divisors (see below), whose sum is σ = 195222279886200. Its totient is φ = 128412877435072.

The previous prime is 161600665016143. The next prime is 161600665016221. The reversal of 161600665016165 is 561610566006161.

It can be written as a sum of positive squares in 4 ways, for example, as 23518212795364 + 138082452220801 = 4849558^2 + 11750849^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161600665016165 - 2²⁴ = 161600648238949 is a prime.

It is a super-3 number, since 3×161600665016165³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108456821414 + ... + 108456822903.

It is an arithmetic number, because the mean of its divisors is an integer number (24402784985775).

Almost surely, 2^{161600665016165} is an apocalyptic number.

It is an amenable number.

161600665016165 is a deficient number, since it is larger than the sum of its proper divisors (33621614870035).

161600665016165 is a wasteful number, since it uses less digits than its factorization.

161600665016165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216913644471.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 161600665016165 in words is "one hundred sixty-one trillion, six hundred billion, six hundred sixty-five million, sixteen thousand, one hundred sixty-five".