18678663 has 12 divisors (see below), whose sum is σ = 27062568. Its totient is φ = 12414480.

The previous prime is 18678643. The next prime is 18678683. The reversal of 18678663 is 36687681.

It is an interprime number because it is at equal distance from previous prime (18678643) and next prime (18678683).

It is not a de Polignac number, because 18678663 - 2¹⁰ = 18677639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18678623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133 + ... + 6113.

It is an arithmetic number, because the mean of its divisors is an integer number (2255214).

Almost surely, 2^18678663 is an apocalyptic number.

18678663 is a deficient number, since it is larger than the sum of its proper divisors (8383905).

18678663 is a wasteful number, since it uses less digits than its factorization.

18678663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6334 (or 6331 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 18678663 is about 4321.8818817733. The cubic root of 18678663 is about 265.3272946629.

The spelling of 18678663 in words is "eighteen million, six hundred seventy-eight thousand, six hundred sixty-three".