18663345 has 16 divisors (see below), whose sum is σ = 33179520. Its totient is φ = 9953712.

The previous prime is 18663341. The next prime is 18663347. The reversal of 18663345 is 54336681.

18663345 is a `hidden beast` number, since 18 + 6 + 633 + 4 + 5 = 666.

It is not a de Polignac number, because 18663345 - 2² = 18663341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18663341) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 68989 + ... + 69258.

It is an arithmetic number, because the mean of its divisors is an integer number (2073720).

Almost surely, 2^18663345 is an apocalyptic number.

18663345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18663345 is a deficient number, since it is larger than the sum of its proper divisors (14516175).

18663345 is a wasteful number, since it uses less digits than its factorization.

18663345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138261 (or 138255 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 18663345 is about 4320.1093736154. The cubic root of 18663345 is about 265.2547449482.

The spelling of 18663345 in words is "eighteen million, six hundred sixty-three thousand, three hundred forty-five".