16656223 has 2 divisors, whose sum is σ = 16656224. Its totient is φ = 16656222.

The previous prime is 16656203. The next prime is 16656239. The reversal of 16656223 is 32265661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16656223 - 2¹³ = 16648031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16656203) 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, 8328111 + 8328112.

It is an arithmetic number, because the mean of its divisors is an integer number (8328112).

Almost surely, 2^16656223 is an apocalyptic number.

16656223 is a deficient number, since it is larger than the sum of its proper divisors (1).

16656223 is an equidigital number, since it uses as much as digits as its factorization.

16656223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 16656223 is about 4081.2036214823. The cubic root of 16656223 is about 255.3831124479.

The spelling of 16656223 in words is "sixteen million, six hundred fifty-six thousand, two hundred twenty-three".