16659613 has 4 divisors (see below), whose sum is σ = 17383968. Its totient is φ = 15935260.

The previous prime is 16659581. The next prime is 16659641. The reversal of 16659613 is 31695661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16659613 - 2⁵ = 16659581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16659673) 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, 362143 + ... + 362188.

It is an arithmetic number, because the mean of its divisors is an integer number (4345992).

Almost surely, 2^16659613 is an apocalyptic number.

It is an amenable number.

16659613 is a deficient number, since it is larger than the sum of its proper divisors (724355).

16659613 is an equidigital number, since it uses as much as digits as its factorization.

16659613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724354.

The product of its digits is 29160, while the sum is 37.

The square root of 16659613 is about 4081.6189190075. The cubic root of 16659613 is about 255.4004371044.

The spelling of 16659613 in words is "sixteen million, six hundred fifty-nine thousand, six hundred thirteen".