16446561 has 8 divisors (see below), whose sum is σ = 21953664. Its totient is φ = 10951920.

The previous prime is 16446559. The next prime is 16446593. The reversal of 16446561 is 16564461.

It is a happy number.

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

It is not a de Polignac number, because 16446561 - 2¹ = 16446559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16446961) 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, 600 + ... + 5766.

It is an arithmetic number, because the mean of its divisors is an integer number (2744208).

Almost surely, 2^16446561 is an apocalyptic number.

It is an amenable number.

16446561 is a deficient number, since it is larger than the sum of its proper divisors (5507103).

16446561 is a wasteful number, since it uses less digits than its factorization.

16446561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6231.

The product of its digits is 17280, while the sum is 33.

The square root of 16446561 is about 4055.4359814945. The cubic root of 16446561 is about 254.3070304991.

The spelling of 16446561 in words is "sixteen million, four hundred forty-six thousand, five hundred sixty-one".