6669509 has 16 divisors (see below), whose sum is σ = 8543616. Its totient is φ = 5054400.

The previous prime is 6669503. The next prime is 6669521. The reversal of 6669509 is 9059666.

It is a cyclic number.

It is not a de Polignac number, because 6669509 - 2⁴ = 6669493 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 (6669503) 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 15 ways as a sum of consecutive naturals, for example, 1679 + ... + 4019.

It is an arithmetic number, because the mean of its divisors is an integer number (533976).

Almost surely, 2^6669509 is an apocalyptic number.

It is an amenable number.

6669509 is a deficient number, since it is larger than the sum of its proper divisors (1874107).

6669509 is a wasteful number, since it uses less digits than its factorization.

6669509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 6669509 is about 2582.5392542999. The cubic root of 6669509 is about 188.2339493566.

The spelling of 6669509 in words is "six million, six hundred sixty-nine thousand, five hundred nine".