16553216 has 18 divisors (see below), whose sum is σ = 33042282. Its totient is φ = 8276480.

The previous prime is 16553209. The next prime is 16553231. The reversal of 16553216 is 61235561.

It can be written as a sum of positive squares in only one way, i.e., 9241600 + 7311616 = 3040^2 + 2704^2 .

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32075 + ... + 32586.

Almost surely, 2^16553216 is an apocalyptic number.

16553216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16553216 is a deficient number, since it is larger than the sum of its proper divisors (16489066).

16553216 is an frugal number, since it uses more digits than its factorization.

16553216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64677 (or 64663 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 16553216 is about 4068.5643659650. The cubic root of 16553216 is about 254.8555686007.

Adding to 16553216 its reverse (61235561), we get a palindrome (77788777).

The spelling of 16553216 in words is "sixteen million, five hundred fifty-three thousand, two hundred sixteen".