16656791 has 2 divisors, whose sum is σ = 16656792. Its totient is φ = 16656790.

The previous prime is 16656769. The next prime is 16656793. The reversal of 16656791 is 19765661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16656791 - 2⁶ = 16656727 is a prime.

Together with 16656793, 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 (16656793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8328395 + 8328396.

It is an arithmetic number, because the mean of its divisors is an integer number (8328396).

Almost surely, 2^16656791 is an apocalyptic number.

16656791 is a deficient number, since it is larger than the sum of its proper divisors (1).

16656791 is an equidigital number, since it uses as much as digits as its factorization.

16656791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 16656791 is about 4081.2732082035. The cubic root of 16656791 is about 255.3860153862.

The spelling of 16656791 in words is "sixteen million, six hundred fifty-six thousand, seven hundred ninety-one".