18729266818 has 8 divisors (see below), whose sum is σ = 28149096060. Its totient is φ = 9346234800.

The previous prime is 18729266813. The next prime is 18729266819. The reversal of 18729266818 is 81866292781.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18624879729 + 104387089 = 136473^2 + 10217^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18729266813) 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, 9198033 + ... + 9200068.

Almost surely, 2^18729266818 is an apocalyptic number.

18729266818 is a deficient number, since it is larger than the sum of its proper divisors (9419829242).

18729266818 is a wasteful number, since it uses less digits than its factorization.

18729266818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18398612.

The product of its digits is 4644864, while the sum is 58.

The spelling of 18729266818 in words is "eighteen billion, seven hundred twenty-nine million, two hundred sixty-six thousand, eight hundred eighteen".