18344501818 has 8 divisors (see below), whose sum is σ = 27967847220. Its totient is φ = 9021886080.

The previous prime is 18344501809. The next prime is 18344501849. The reversal of 18344501818 is 81810544381.

It can be written as a sum of positive squares in 2 ways, for example, as 17695118529 + 649383289 = 133023^2 + 25483^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75182263 + ... + 75182506.

Almost surely, 2^18344501818 is an apocalyptic number.

18344501818 is a deficient number, since it is larger than the sum of its proper divisors (9623345402).

18344501818 is a wasteful number, since it uses less digits than its factorization.

18344501818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150364832.

The product of its (nonzero) digits is 122880, while the sum is 43.

The spelling of 18344501818 in words is "eighteen billion, three hundred forty-four million, five hundred one thousand, eight hundred eighteen".