16657223 has 24 divisors (see below), whose sum is σ = 19535040. Its totient is φ = 14168000.

The previous prime is 16657219. The next prime is 16657237. The reversal of 16657223 is 32275661.

It is not a de Polignac number, because 16657223 - 2² = 16657219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16657223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16657253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164873 + ... + 164973.

It is an arithmetic number, because the mean of its divisors is an integer number (813960).

Almost surely, 2^16657223 is an apocalyptic number.

16657223 is a deficient number, since it is larger than the sum of its proper divisors (2877817).

16657223 is a wasteful number, since it uses less digits than its factorization.

16657223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 188 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 16657223 is about 4081.3261325211. The cubic root of 16657223 is about 255.3882232105.

It can be divided in two parts, 1665 and 7223, that added together give a palindrome (8888).

The spelling of 16657223 in words is "sixteen million, six hundred fifty-seven thousand, two hundred twenty-three".