16561326 has 8 divisors (see below), whose sum is σ = 33122664. Its totient is φ = 5520440.

The previous prime is 16561313. The next prime is 16561327. The reversal of 16561326 is 62316561.

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

16561326 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16561293 and 16561302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561327) 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, 1380105 + ... + 1380116.

It is an arithmetic number, because the mean of its divisors is an integer number (4140333).

Almost surely, 2^16561326 is an apocalyptic number.

16561326 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16561326 is a wasteful number, since it uses less digits than its factorization.

16561326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760226.

The product of its digits is 6480, while the sum is 30.

The square root of 16561326 is about 4069.5609099754. The cubic root of 16561326 is about 254.8971826937.

Adding to 16561326 its reverse (62316561), we get a palindrome (78877887).

The spelling of 16561326 in words is "sixteen million, five hundred sixty-one thousand, three hundred twenty-six".