16561426 has 32 divisors (see below), whose sum is σ = 31196160. Its totient is φ = 6429456.

The previous prime is 16561423. The next prime is 16561469. The reversal of 16561426 is 62416561.

It is not an unprimeable number, because it can be changed into a prime (16561423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4765 + ... + 7471.

It is an arithmetic number, because the mean of its divisors is an integer number (974880).

Almost surely, 2^16561426 is an apocalyptic number.

16561426 is a deficient number, since it is larger than the sum of its proper divisors (14634734).

16561426 is a wasteful number, since it uses less digits than its factorization.

16561426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758.

The product of its digits is 8640, while the sum is 31.

The square root of 16561426 is about 4069.5731962947. The cubic root of 16561426 is about 254.8976957296.

Adding to 16561426 its reverse (62416561), we get a palindrome (78977987).

The spelling of 16561426 in words is "sixteen million, five hundred sixty-one thousand, four hundred twenty-six".