18666824505 has 16 divisors (see below), whose sum is σ = 34133622144. Its totient is φ = 8533405440.

The previous prime is 18666824503. The next prime is 18666824509. The reversal of 18666824505 is 50542866681.

It is not a de Polignac number, because 18666824505 - 2¹ = 18666824503 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18666824503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88889536 + ... + 88889745.

It is an arithmetic number, because the mean of its divisors is an integer number (2133351384).

Almost surely, 2^18666824505 is an apocalyptic number.

18666824505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18666824505 is a deficient number, since it is larger than the sum of its proper divisors (15466797639).

18666824505 is a wasteful number, since it uses less digits than its factorization.

18666824505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177779296.

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 18666824505 in words is "eighteen billion, six hundred sixty-six million, eight hundred twenty-four thousand, five hundred five".