16681799 has 2 divisors, whose sum is σ = 16681800. Its totient is φ = 16681798.

The previous prime is 16681789. The next prime is 16681801. The reversal of 16681799 is 99718661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16681799 is a prime.

Together with 16681801, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16681789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340899 + 8340900.

It is an arithmetic number, because the mean of its divisors is an integer number (8340900).

Almost surely, 2^16681799 is an apocalyptic number.

16681799 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681799 is an equidigital number, since it uses as much as digits as its factorization.

16681799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 16681799 is about 4084.3358089168. The cubic root of 16681799 is about 255.5137610781.

The spelling of 16681799 in words is "sixteen million, six hundred eighty-one thousand, seven hundred ninety-nine".