16564943 has 8 divisors (see below), whose sum is σ = 17517696. Its totient is φ = 15638400.

The previous prime is 16564927. The next prime is 16564963. The reversal of 16564943 is 34946561.

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 16564943 - 2⁴ = 16564927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16564897 and 16564906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564963) 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, 5246 + ... + 7787.

It is an arithmetic number, because the mean of its divisors is an integer number (2189712).

Almost surely, 2^16564943 is an apocalyptic number.

16564943 is a deficient number, since it is larger than the sum of its proper divisors (952753).

16564943 is a wasteful number, since it uses less digits than its factorization.

16564943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13105.

The product of its digits is 77760, while the sum is 38.

The square root of 16564943 is about 4070.0052825519. The cubic root of 16564943 is about 254.9157378907.

The spelling of 16564943 in words is "sixteen million, five hundred sixty-four thousand, nine hundred forty-three".