16645516 has 12 divisors (see below), whose sum is σ = 30843288. Its totient is φ = 7833152.

The previous prime is 16645513. The next prime is 16645553. The reversal of 16645516 is 61554661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (16645513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122326 + ... + 122461.

It is an arithmetic number, because the mean of its divisors is an integer number (2570274).

Almost surely, 2^16645516 is an apocalyptic number.

It is an amenable number.

16645516 is a deficient number, since it is larger than the sum of its proper divisors (14197772).

16645516 is a wasteful number, since it uses less digits than its factorization.

16645516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244808 (or 244806 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 16645516 is about 4079.8916652284. The cubic root of 16645516 is about 255.3283786886.

It can be divided in two parts, 16645 and 516, that added together give a square (17161 = 131²).

The spelling of 16645516 in words is "sixteen million, six hundred forty-five thousand, five hundred sixteen".