16643351 has 2 divisors, whose sum is σ = 16643352. Its totient is φ = 16643350.

The previous prime is 16643339. The next prime is 16643353. The reversal of 16643351 is 15334661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16643351 - 2⁶ = 16643287 is a prime.

It is a super-2 number, since 2×16643351² = 554002265018402, which contains 22 as substring.

Together with 16643353, 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 (16643353) 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, 8321675 + 8321676.

It is an arithmetic number, because the mean of its divisors is an integer number (8321676).

Almost surely, 2^16643351 is an apocalyptic number.

16643351 is a deficient number, since it is larger than the sum of its proper divisors (1).

16643351 is an equidigital number, since it uses as much as digits as its factorization.

16643351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 16643351 is about 4079.6263309279. The cubic root of 16643351 is about 255.3173084419.

The spelling of 16643351 in words is "sixteen million, six hundred forty-three thousand, three hundred fifty-one".