6646609 has 16 divisors (see below), whose sum is σ = 7464960. Its totient is φ = 5885440.

The previous prime is 6646579. The next prime is 6646613. The reversal of 6646609 is 9066466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6646609 is a prime.

It is a super-2 number, since 2×6646609² = 88354822397762, which contains 22 as substring.

It is a Duffinian number.

6646609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6646669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34704 + ... + 34894.

It is an arithmetic number, because the mean of its divisors is an integer number (466560).

Almost surely, 2^6646609 is an apocalyptic number.

It is an amenable number.

6646609 is a deficient number, since it is larger than the sum of its proper divisors (818351).

6646609 is a wasteful number, since it uses less digits than its factorization.

6646609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 6646609 is about 2578.1018211079. The cubic root of 6646609 is about 188.0182662952.

The spelling of 6646609 in words is "six million, six hundred forty-six thousand, six hundred nine".