16656593 has 2 divisors, whose sum is σ = 16656594. Its totient is φ = 16656592.

The previous prime is 16656581. The next prime is 16656631. The reversal of 16656593 is 39565661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12588304 + 4068289 = 3548^2 + 2017^2 .

It is a cyclic number.

It is not a de Polignac number, because 16656593 - 2¹⁸ = 16394449 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16656593.

It is not a weakly prime, because it can be changed into another prime (16656533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8328296 + 8328297.

It is an arithmetic number, because the mean of its divisors is an integer number (8328297).

Almost surely, 2^16656593 is an apocalyptic number.

It is an amenable number.

16656593 is a deficient number, since it is larger than the sum of its proper divisors (1).

16656593 is an equidigital number, since it uses as much as digits as its factorization.

16656593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 41.

The square root of 16656593 is about 4081.2489509953. The cubic root of 16656593 is about 255.3850034539.

The spelling of 16656593 in words is "sixteen million, six hundred fifty-six thousand, five hundred ninety-three".