16655623 has 4 divisors (see below), whose sum is σ = 16928728. Its totient is φ = 16382520.

The previous prime is 16655593. The next prime is 16655633. The reversal of 16655623 is 32655661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32655661 = 19 ⋅1718719.

It is a cyclic number.

It is not a de Polignac number, because 16655623 - 2¹⁷ = 16524551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16655633) 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 in 3 ways as a sum of consecutive naturals, for example, 136461 + ... + 136582.

It is an arithmetic number, because the mean of its divisors is an integer number (4232182).

Almost surely, 2^16655623 is an apocalyptic number.

16655623 is a deficient number, since it is larger than the sum of its proper divisors (273105).

16655623 is an equidigital number, since it uses as much as digits as its factorization.

16655623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273104.

The product of its digits is 32400, while the sum is 34.

The square root of 16655623 is about 4081.1301130937. The cubic root of 16655623 is about 255.3800458922.

The spelling of 16655623 in words is "sixteen million, six hundred fifty-five thousand, six hundred twenty-three".