16644145 has 16 divisors (see below), whose sum is σ = 22896000. Its totient is φ = 11378304.

The previous prime is 16644137. The next prime is 16644149. The reversal of 16644145 is 54144661.

It is not a de Polignac number, because 16644145 - 2³ = 16644137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16644149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16989 + ... + 17941.

It is an arithmetic number, because the mean of its divisors is an integer number (1431000).

Almost surely, 2^16644145 is an apocalyptic number.

It is an amenable number.

16644145 is a deficient number, since it is larger than the sum of its proper divisors (6251855).

16644145 is an equidigital number, since it uses as much as digits as its factorization.

16644145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464.

The product of its digits is 11520, while the sum is 31.

The square root of 16644145 is about 4079.7236426013. The cubic root of 16644145 is about 255.3213684960.

The spelling of 16644145 in words is "sixteen million, six hundred forty-four thousand, one hundred forty-five".