18142824181 has 4 divisors (see below), whose sum is σ = 18143375500. Its totient is φ = 18142272864.

The previous prime is 18142824151. The next prime is 18142824197.

It is a happy number.

18142824181 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9313215025 + 8829609156 = 96505^2 + 93966^2 .

It is a cyclic number.

It is not a de Polignac number, because 18142824181 - 2¹¹ = 18142822133 is a prime.

It is a super-2 number, since 2×18142824181² (a number of 21 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 (18142824151) 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, 222936 + ... + 293233.

It is an arithmetic number, because the mean of its divisors is an integer number (4535843875).

Almost surely, 2^18142824181 is an apocalyptic number.

It is an amenable number.

18142824181 is a deficient number, since it is larger than the sum of its proper divisors (551319).

18142824181 is an equidigital number, since it uses as much as digits as its factorization.

18142824181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551318.

The product of its digits is 32768, while the sum is 40.

The spelling of 18142824181 in words is "eighteen billion, one hundred forty-two million, eight hundred twenty-four thousand, one hundred eighty-one".