16651408 has 20 divisors (see below), whose sum is σ = 32597740. Its totient is φ = 8239104.

The previous prime is 16651399. The next prime is 16651409. The reversal of 16651408 is 80415661.

It can be written as a sum of positive squares in 2 ways, for example, as 10036224 + 6615184 = 3168^2 + 2572^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16651408.

It is not an unprimeable number, because it can be changed into a prime (16651409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3813 + ... + 6916.

It is an arithmetic number, because the mean of its divisors is an integer number (1629887).

Almost surely, 2^16651408 is an apocalyptic number.

It is an amenable number.

16651408 is a deficient number, since it is larger than the sum of its proper divisors (15946332).

16651408 is a wasteful number, since it uses less digits than its factorization.

16651408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10834 (or 10828 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 16651408 is about 4080.6136793379. The cubic root of 16651408 is about 255.3585012621.

The spelling of 16651408 in words is "sixteen million, six hundred fifty-one thousand, four hundred eight".