9966509 has 8 divisors (see below), whose sum is σ = 11409408. Its totient is φ = 8528400.

The previous prime is 9966503. The next prime is 9966511. The reversal of 9966509 is 9056699.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9966509 - 2⁴ = 9966493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9966509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9966503) 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 7 ways as a sum of consecutive naturals, for example, 7439 + ... + 8675.

It is an arithmetic number, because the mean of its divisors is an integer number (1426176).

Almost surely, 2^9966509 is an apocalyptic number.

It is an amenable number.

9966509 is a deficient number, since it is larger than the sum of its proper divisors (1442899).

9966509 is a wasteful number, since it uses less digits than its factorization.

9966509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 9966509 is about 3156.9778269731. The cubic root of 9966509 is about 215.2026860934.

The spelling of 9966509 in words is "nine million, nine hundred sixty-six thousand, five hundred nine".