16644945 has 8 divisors (see below), whose sum is σ = 26631936. Its totient is φ = 8877296.

The previous prime is 16644919. The next prime is 16644961. The reversal of 16644945 is 54944661.

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

It is a cyclic number.

It is not a de Polignac number, because 16644945 - 2⁸ = 16644689 is a prime.

It is an unprimeable number.

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, 554817 + ... + 554846.

It is an arithmetic number, because the mean of its divisors is an integer number (3328992).

Almost surely, 2^16644945 is an apocalyptic number.

16644945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16644945 is a deficient number, since it is larger than the sum of its proper divisors (9986991).

16644945 is a wasteful number, since it uses less digits than its factorization.

16644945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109671.

The product of its digits is 103680, while the sum is 39.

The square root of 16644945 is about 4079.8216872800. The cubic root of 16644945 is about 255.3254591001.

The spelling of 16644945 in words is "sixteen million, six hundred forty-four thousand, nine hundred forty-five".