9966659 has 8 divisors (see below), whose sum is σ = 10947840. Its totient is φ = 9031176.

The previous prime is 9966643. The next prime is 9966667. The reversal of 9966659 is 9566699.

It is a happy number.

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 9966659 - 2⁴ = 9966643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9966629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10967 + ... + 11840.

It is an arithmetic number, because the mean of its divisors is an integer number (1368480).

Almost surely, 2^9966659 is an apocalyptic number.

9966659 is a deficient number, since it is larger than the sum of its proper divisors (981181).

9966659 is a wasteful number, since it uses less digits than its factorization.

9966659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22849.

The product of its digits is 787320, while the sum is 50.

The square root of 9966659 is about 3157.0015837817. The cubic root of 9966659 is about 215.2037657172.

The spelling of 9966659 in words is "nine million, nine hundred sixty-six thousand, six hundred fifty-nine".