16681823 has 2 divisors, whose sum is σ = 16681824. Its totient is φ = 16681822.

The previous prime is 16681817. The next prime is 16681843. The reversal of 16681823 is 32818661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16681823 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16681843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340911 + 8340912.

It is an arithmetic number, because the mean of its divisors is an integer number (8340912).

Almost surely, 2^16681823 is an apocalyptic number.

16681823 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681823 is an equidigital number, since it uses as much as digits as its factorization.

16681823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 16681823 is about 4084.3387469699. The cubic root of 16681823 is about 255.5138836133.

The spelling of 16681823 in words is "sixteen million, six hundred eighty-one thousand, eight hundred twenty-three".