9966664 has 8 divisors (see below), whose sum is σ = 18687510. Its totient is φ = 4983328.

The previous prime is 9966643. The next prime is 9966667. The reversal of 9966664 is 4666699.

It can be written as a sum of positive squares in only one way, i.e., 8122500 + 1844164 = 2850^2 + 1358^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9966667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622909 + ... + 622924.

Almost surely, 2^9966664 is an apocalyptic number.

It is an amenable number.

9966664 is a deficient number, since it is larger than the sum of its proper divisors (8720846).

9966664 is a wasteful number, since it uses less digits than its factorization.

9966664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245839 (or 1245835 counting only the distinct ones).

The product of its digits is 419904, while the sum is 46.

The square root of 9966664 is about 3157.0023756722. The cubic root of 9966664 is about 215.2038017045.

The spelling of 9966664 in words is "nine million, nine hundred sixty-six thousand, six hundred sixty-four".