16673561 has 4 divisors (see below), whose sum is σ = 16684800. Its totient is φ = 16662324.

The previous prime is 16673519. The next prime is 16673599. The reversal of 16673561 is 16537661.

It is a happy number.

16673561 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16673561 - 2⁶ = 16673497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16673161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2981 + ... + 6498.

It is an arithmetic number, because the mean of its divisors is an integer number (4171200).

Almost surely, 2^16673561 is an apocalyptic number.

It is an amenable number.

16673561 is a deficient number, since it is larger than the sum of its proper divisors (11239).

16673561 is an equidigital number, since it uses as much as digits as its factorization.

16673561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11238.

The product of its digits is 22680, while the sum is 35.

The square root of 16673561 is about 4083.3271972743. The cubic root of 16673561 is about 255.4716938935.

The spelling of 16673561 in words is "sixteen million, six hundred seventy-three thousand, five hundred sixty-one".