16561316 has 12 divisors (see below), whose sum is σ = 29917440. Its totient is φ = 8013480.

The previous prime is 16561313. The next prime is 16561327. The reversal of 16561316 is 61316561.

It is not an unprimeable number, because it can be changed into a prime (16561313) 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 3 ways as a sum of consecutive naturals, for example, 66656 + ... + 66903.

It is an arithmetic number, because the mean of its divisors is an integer number (2493120).

Almost surely, 2^16561316 is an apocalyptic number.

It is an amenable number.

16561316 is a deficient number, since it is larger than the sum of its proper divisors (13356124).

16561316 is a wasteful number, since it uses less digits than its factorization.

16561316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133594 (or 133592 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 16561316 is about 4069.5596813415. The cubic root of 16561316 is about 254.8971313900.

Adding to 16561316 its reverse (61316561), we get a palindrome (77877877).

The spelling of 16561316 in words is "sixteen million, five hundred sixty-one thousand, three hundred sixteen".