18582228581 has 4 divisors (see below), whose sum is σ = 21236832672. Its totient is φ = 15927624492.

The previous prime is 18582228569. The next prime is 18582228583.

It is a happy number.

18582228581 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18582228581 - 2¹⁰ = 18582227557 is a prime.

It is a super-2 number, since 2×18582228581² (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 (18582228583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1327302035 + ... + 1327302048.

It is an arithmetic number, because the mean of its divisors is an integer number (5309208168).

Almost surely, 2^18582228581 is an apocalyptic number.

It is an amenable number.

18582228581 is a deficient number, since it is larger than the sum of its proper divisors (2654604091).

18582228581 is an equidigital number, since it uses as much as digits as its factorization.

18582228581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654604090.

The product of its digits is 819200, while the sum is 50.

The spelling of 18582228581 in words is "eighteen billion, five hundred eighty-two million, two hundred twenty-eight thousand, five hundred eighty-one".