18007663 has 2 divisors, whose sum is σ = 18007664. Its totient is φ = 18007662.

The previous prime is 18007609. The next prime is 18007697. The reversal of 18007663 is 36670081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18007663 - 2⁹ = 18007151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18007963) 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 as a sum of consecutive naturals, namely, 9003831 + 9003832.

It is an arithmetic number, because the mean of its divisors is an integer number (9003832).

Almost surely, 2^18007663 is an apocalyptic number.

18007663 is a deficient number, since it is larger than the sum of its proper divisors (1).

18007663 is an equidigital number, since it uses as much as digits as its factorization.

18007663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 18007663 is about 4243.5436842337. The cubic root of 18007663 is about 262.1113244062. Note that the first 3 decimals are identical.

The spelling of 18007663 in words is "eighteen million, seven thousand, six hundred sixty-three".