18316643 has 2 divisors, whose sum is σ = 18316644. Its totient is φ = 18316642.

The previous prime is 18316631. The next prime is 18316673. The reversal of 18316643 is 34661381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18316643 - 2¹⁸ = 18054499 is a prime.

It is not a weakly prime, because it can be changed into another prime (18316673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9158321 + 9158322.

It is an arithmetic number, because the mean of its divisors is an integer number (9158322).

Almost surely, 2^18316643 is an apocalyptic number.

18316643 is a deficient number, since it is larger than the sum of its proper divisors (1).

18316643 is an equidigital number, since it uses as much as digits as its factorization.

18316643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 18316643 is about 4279.7947380686. The cubic root of 18316643 is about 263.6019550561.

The spelling of 18316643 in words is "eighteen million, three hundred sixteen thousand, six hundred forty-three".