16644453 has 8 divisors (see below), whose sum is σ = 25363008. Its totient is φ = 9511104.

The previous prime is 16644449. The next prime is 16644469. The reversal of 16644453 is 35444661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16644453 - 2² = 16644449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16644403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396276 + ... + 396317.

It is an arithmetic number, because the mean of its divisors is an integer number (3170376).

Almost surely, 2^16644453 is an apocalyptic number.

It is an amenable number.

16644453 is a deficient number, since it is larger than the sum of its proper divisors (8718555).

16644453 is an equidigital number, since it uses as much as digits as its factorization.

16644453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792603.

The product of its digits is 34560, while the sum is 33.

The square root of 16644453 is about 4079.7613900815. The cubic root of 16644453 is about 255.3229433941.

The spelling of 16644453 in words is "sixteen million, six hundred forty-four thousand, four hundred fifty-three".