18123663 has 8 divisors (see below), whose sum is σ = 25436800. Its totient is φ = 11446488.

The previous prime is 18123659. The next prime is 18123689. The reversal of 18123663 is 36632181.

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

It is not a de Polignac number, because 18123663 - 2² = 18123659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18123663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18123613) 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, 158923 + ... + 159036.

It is an arithmetic number, because the mean of its divisors is an integer number (3179600).

Almost surely, 2^18123663 is an apocalyptic number.

18123663 is a deficient number, since it is larger than the sum of its proper divisors (7313137).

18123663 is a wasteful number, since it uses less digits than its factorization.

18123663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317981.

The product of its digits is 5184, while the sum is 30.

The square root of 18123663 is about 4257.1895658991. The cubic root of 18123663 is about 262.6729345720.

The spelling of 18123663 in words is "eighteen million, one hundred twenty-three thousand, six hundred sixty-three".