18663245 has 4 divisors (see below), whose sum is σ = 22395900. Its totient is φ = 14930592.

The previous prime is 18663233. The next prime is 18663257. The reversal of 18663245 is 54236681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54236681 = 17 ⋅3190393.

It is an interprime number because it is at equal distance from previous prime (18663233) and next prime (18663257).

It can be written as a sum of positive squares in 2 ways, for example, as 14891881 + 3771364 = 3859^2 + 1942^2 .

It is a cyclic number.

It is not a de Polignac number, because 18663245 - 2⁶ = 18663181 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 1866320 + ... + 1866329.

It is an arithmetic number, because the mean of its divisors is an integer number (5598975).

Almost surely, 2^18663245 is an apocalyptic number.

It is an amenable number.

18663245 is a deficient number, since it is larger than the sum of its proper divisors (3732655).

18663245 is an equidigital number, since it uses as much as digits as its factorization.

18663245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3732654.

The product of its digits is 34560, while the sum is 35.

The square root of 18663245 is about 4320.0977998189. The cubic root of 18663245 is about 265.2542711938.

The spelling of 18663245 in words is "eighteen million, six hundred sixty-three thousand, two hundred forty-five".