9665665 has 4 divisors (see below), whose sum is σ = 11598804. Its totient is φ = 7732528.

The previous prime is 9665657. The next prime is 9665701. The reversal of 9665665 is 5665669.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5665669 = 241 ⋅23509.

It can be written as a sum of positive squares in 2 ways, for example, as 1185921 + 8479744 = 1089^2 + 2912^2 .

It is a cyclic number.

It is not a de Polignac number, because 9665665 - 2³ = 9665657 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 966562 + ... + 966571.

It is an arithmetic number, because the mean of its divisors is an integer number (2899701).

Almost surely, 2^9665665 is an apocalyptic number.

It is an amenable number.

9665665 is a deficient number, since it is larger than the sum of its proper divisors (1933139).

9665665 is a wasteful number, since it uses less digits than its factorization.

9665665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933138.

The product of its digits is 291600, while the sum is 43.

The square root of 9665665 is about 3108.9652619481. The cubic root of 9665665 is about 213.0151928446.

It can be divided in two parts, 96656 and 65, that added together give a square (96721 = 311²).

The spelling of 9665665 in words is "nine million, six hundred sixty-five thousand, six hundred sixty-five".