18004663 has 4 divisors (see below), whose sum is σ = 18146560. Its totient is φ = 17862768.

The previous prime is 18004661. The next prime is 18004673. The reversal of 18004663 is 36640081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36640081 = 23 ⋅1593047.

It is a cyclic number.

It is not a de Polignac number, because 18004663 - 2¹ = 18004661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18004661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70758 + ... + 71011.

It is an arithmetic number, because the mean of its divisors is an integer number (4536640).

Almost surely, 2^18004663 is an apocalyptic number.

18004663 is a deficient number, since it is larger than the sum of its proper divisors (141897).

18004663 is a wasteful number, since it uses less digits than its factorization.

18004663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141896.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 18004663 is about 4243.1901913537. The cubic root of 18004663 is about 262.0967680542.

The spelling of 18004663 in words is "eighteen million, four thousand, six hundred sixty-three".