18424649818 has 16 divisors (see below), whose sum is σ = 27900200520. Its totient is φ = 9124979776.

The previous prime is 18424649807. The next prime is 18424649819. The reversal of 18424649818 is 81894642481.

It can be written as a sum of positive squares in 4 ways, for example, as 12629938689 + 5794711129 = 112383^2 + 76123^2 .

It is not an unprimeable number, because it can be changed into a prime (18424649819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5905 + ... + 192052.

Almost surely, 2^18424649818 is an apocalyptic number.

18424649818 is a deficient number, since it is larger than the sum of its proper divisors (9475550702).

18424649818 is a wasteful number, since it uses less digits than its factorization.

18424649818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198401.

The product of its digits is 3538944, while the sum is 55.

The spelling of 18424649818 in words is "eighteen billion, four hundred twenty-four million, six hundred forty-nine thousand, eight hundred eighteen".