161600665101109 has 6 divisors (see below), whose sum is σ = 174987702446946. Its totient is φ = 149169844708560.

The previous prime is 161600665101091. The next prime is 161600665101167. The reversal of 161600665101109 is 901101566006161.

It can be written as a sum of positive squares in 3 ways, for example, as 21968109610225 + 139632555490884 = 4687015^2 + 11816622^2 .

It is not a de Polignac number, because 161600665101109 - 2²⁷ = 161600530883381 is a prime.

It is a super-2 number, since 2×161600665101109² (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 (161600665101409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 478108476462 + ... + 478108476799.

It is an arithmetic number, because the mean of its divisors is an integer number (29164617074491).

Almost surely, 2^{161600665101109} is an apocalyptic number.

It is an amenable number.

161600665101109 is a deficient number, since it is larger than the sum of its proper divisors (13387037345837).

161600665101109 is an equidigital number, since it uses as much as digits as its factorization.

161600665101109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956216953287 (or 956216953274 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 43.

The spelling of 161600665101109 in words is "one hundred sixty-one trillion, six hundred billion, six hundred sixty-five million, one hundred one thousand, one hundred nine".