18543223106 has 8 divisors (see below), whose sum is σ = 27886339260. Its totient is φ = 9247776688.

The previous prime is 18543223087. The next prime is 18543223151. The reversal of 18543223106 is 60132234581.

It can be written as a sum of positive squares in 2 ways, for example, as 18377869225 + 165353881 = 135565^2 + 12859^2 .

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

It is a super-2 number, since 2×18543223106² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11916461 + ... + 11918016.

Almost surely, 2^18543223106 is an apocalyptic number.

18543223106 is a deficient number, since it is larger than the sum of its proper divisors (9343116154).

18543223106 is a wasteful number, since it uses less digits than its factorization.

18543223106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23834868.

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 18543223106 its reverse (60132234581), we get a palindrome (78675457687).

The spelling of 18543223106 in words is "eighteen billion, five hundred forty-three million, two hundred twenty-three thousand, one hundred six".