16445643 has 8 divisors (see below), whose sum is σ = 21997968. Its totient is φ = 10928544.

The previous prime is 16445623. The next prime is 16445677. The reversal of 16445643 is 34654461.

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

It is not a de Polignac number, because 16445643 - 2¹⁶ = 16380107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16445603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7696 + ... + 9597.

It is an arithmetic number, because the mean of its divisors is an integer number (2749746).

Almost surely, 2^16445643 is an apocalyptic number.

16445643 is a deficient number, since it is larger than the sum of its proper divisors (5552325).

16445643 is a wasteful number, since it uses less digits than its factorization.

16445643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17613.

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

The square root of 16445643 is about 4055.3227984958. The cubic root of 16445643 is about 254.3022988474.

The spelling of 16445643 in words is "sixteen million, four hundred forty-five thousand, six hundred forty-three".