16665604 has 12 divisors (see below), whose sum is σ = 30170700. Its totient is φ = 8045408.

The previous prime is 16665601. The next prime is 16665613. The reversal of 16665604 is 40656661.

It can be written as a sum of positive squares in 2 ways, for example, as 3992004 + 12673600 = 1998^2 + 3560^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16665604.

It is not an unprimeable number, because it can be changed into a prime (16665601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71719 + ... + 71950.

It is an arithmetic number, because the mean of its divisors is an integer number (2514225).

Almost surely, 2^16665604 is an apocalyptic number.

It is an amenable number.

16665604 is a deficient number, since it is larger than the sum of its proper divisors (13505096).

16665604 is a wasteful number, since it uses less digits than its factorization.

16665604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143702 (or 143700 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 16665604 is about 4082.3527530090. The cubic root of 16665604 is about 255.4310484725.

The spelling of 16665604 in words is "sixteen million, six hundred sixty-five thousand, six hundred four".