161135321123 has 8 divisors (see below), whose sum is σ = 189131805792. Its totient is φ = 134383124736.

The previous prime is 161135321071. The next prime is 161135321143. The reversal of 161135321123 is 321123531161.

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

It is not a de Polignac number, because 161135321123 - 2¹⁴ = 161135304739 is a prime.

It is a super-2 number, since 2×161135321123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161135321143) 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, 311071790 + ... + 311072307.

It is an arithmetic number, because the mean of its divisors is an integer number (23641475724).

Almost surely, 2^161135321123 is an apocalyptic number.

161135321123 is a deficient number, since it is larger than the sum of its proper divisors (27996484669).

161135321123 is an equidigital number, since it uses as much as digits as its factorization.

161135321123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622144141.

The product of its digits is 3240, while the sum is 29.

Adding to 161135321123 its reverse (321123531161), we get a palindrome (482258852284).

The spelling of 161135321123 in words is "one hundred sixty-one billion, one hundred thirty-five million, three hundred twenty-one thousand, one hundred twenty-three".