9966655 has 8 divisors (see below), whose sum is σ = 12345984. Its totient is φ = 7716000.

The previous prime is 9966643. The next prime is 9966667. The reversal of 9966655 is 5566699.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9966643) and next prime (9966667).

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

It is not a de Polignac number, because 9966655 - 2⁵ = 9966623 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

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, 31996 + ... + 32305.

It is an arithmetic number, because the mean of its divisors is an integer number (1543248).

Almost surely, 2^9966655 is an apocalyptic number.

9966655 is a deficient number, since it is larger than the sum of its proper divisors (2379329).

9966655 is a wasteful number, since it uses less digits than its factorization.

9966655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64337.

The product of its digits is 437400, while the sum is 46.

The square root of 9966655 is about 3157.0009502691. Note that the first 3 decimals coincide. The cubic root of 9966655 is about 215.2037369274.

The spelling of 9966655 in words is "nine million, nine hundred sixty-six thousand, six hundred fifty-five".