18522872818 has 8 divisors (see below), whose sum is σ = 29418680412. Its totient is φ = 8716646016.

The previous prime is 18522872813. The next prime is 18522872821. The reversal of 18522872818 is 81827822581.

It can be written as a sum of positive squares in 2 ways, for example, as 18228510169 + 294362649 = 135013^2 + 17157^2 .

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

It is a super-2 number, since 2×18522872818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18522872813) 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, 272395155 + ... + 272395222.

Almost surely, 2^18522872818 is an apocalyptic number.

18522872818 is a deficient number, since it is larger than the sum of its proper divisors (10895807594).

18522872818 is a wasteful number, since it uses less digits than its factorization.

18522872818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544790396.

The product of its digits is 1146880, while the sum is 52.

The spelling of 18522872818 in words is "eighteen billion, five hundred twenty-two million, eight hundred seventy-two thousand, eight hundred eighteen".