161605560111085 has 8 divisors (see below), whose sum is σ = 194023781144856. Its totient is φ = 129219708747840.

The previous prime is 161605560111031. The next prime is 161605560111089. The reversal of 161605560111085 is 580111065506161.

It can be written as a sum of positive squares in 4 ways, for example, as 11260245985641 + 150345314125444 = 3355629^2 + 12261538^2 .

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

It is not a de Polignac number, because 161605560111085 - 2⁷ = 161605560110957 is a prime.

It is a super-2 number, since 2×161605560111085² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161605560111089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8092406646 + ... + 8092426615.

It is an arithmetic number, because the mean of its divisors is an integer number (24252972643107).

Almost surely, 2^{161605560111085} is an apocalyptic number.

It is an amenable number.

161605560111085 is a deficient number, since it is larger than the sum of its proper divisors (32418221033771).

161605560111085 is a wasteful number, since it uses less digits than its factorization.

161605560111085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16184835263.

The product of its (nonzero) digits is 216000, while the sum is 46.

The spelling of 161605560111085 in words is "one hundred sixty-one trillion, six hundred five billion, five hundred sixty million, one hundred eleven thousand, eighty-five".