18666824518 has 16 divisors (see below), whose sum is σ = 29501312256. Its totient is φ = 8840933640.

The previous prime is 18666824509. The next prime is 18666824543. The reversal of 18666824518 is 81542866681.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1965168 + ... + 1974643.

It is an arithmetic number, because the mean of its divisors is an integer number (1843832016).

Almost surely, 2^18666824518 is an apocalyptic number.

18666824518 is a deficient number, since it is larger than the sum of its proper divisors (10834487738).

18666824518 is a wasteful number, since it uses less digits than its factorization.

18666824518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939939.

The product of its digits is 4423680, while the sum is 55.

The spelling of 18666824518 in words is "eighteen billion, six hundred sixty-six million, eight hundred twenty-four thousand, five hundred eighteen".