16331242181 has 4 divisors (see below), whose sum is σ = 16390200012. Its totient is φ = 16272284352.

The previous prime is 16331242163. The next prime is 16331242183. The reversal of 16331242181 is 18124213361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18124213361 = 601 ⋅30156761.

It can be written as a sum of positive squares in 2 ways, for example, as 10939277281 + 5391964900 = 104591^2 + 73430^2 .

It is a cyclic number.

It is not a de Polignac number, because 16331242181 - 2¹⁸ = 16330980037 is a prime.

It is a super-2 number, since 2×16331242181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16331242183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29478500 + ... + 29479053.

It is an arithmetic number, because the mean of its divisors is an integer number (4097550003).

Almost surely, 2^16331242181 is an apocalyptic number.

It is an amenable number.

16331242181 is a deficient number, since it is larger than the sum of its proper divisors (58957831).

16331242181 is an equidigital number, since it uses as much as digits as its factorization.

16331242181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58957830.

The product of its digits is 6912, while the sum is 32.

The spelling of 16331242181 in words is "sixteen billion, three hundred thirty-one million, two hundred forty-two thousand, one hundred eighty-one".