18914556818 has 4 divisors (see below), whose sum is σ = 28371835230. Its totient is φ = 9457278408.

The previous prime is 18914556811. The next prime is 18914556823. The reversal of 18914556818 is 81865541981.

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

It can be written as a sum of positive squares in only one way, i.e., 16766883169 + 2147673649 = 129487^2 + 46343^2 .

It is not an unprimeable number, because it can be changed into a prime (18914556811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4728639203 + ... + 4728639206.

Almost surely, 2^18914556818 is an apocalyptic number.

18914556818 is a deficient number, since it is larger than the sum of its proper divisors (9457278412).

18914556818 is an equidigital number, since it uses as much as digits as its factorization.

18914556818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9457278411.

The product of its digits is 2764800, while the sum is 56.

The spelling of 18914556818 in words is "eighteen billion, nine hundred fourteen million, five hundred fifty-six thousand, eight hundred eighteen".