9959665 has 4 divisors (see below), whose sum is σ = 11951604. Its totient is φ = 7967728.

The previous prime is 9959659. The next prime is 9959683. The reversal of 9959665 is 5669599.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5049009 + 4910656 = 2247^2 + 2216^2 .

It is a cyclic number.

It is not a de Polignac number, because 9959665 - 2⁵ = 9959633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995962 + ... + 995971.

It is an arithmetic number, because the mean of its divisors is an integer number (2987901).

Almost surely, 2^9959665 is an apocalyptic number.

It is an amenable number.

9959665 is a deficient number, since it is larger than the sum of its proper divisors (1991939).

9959665 is a wasteful number, since it uses less digits than its factorization.

9959665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991938.

The product of its digits is 656100, while the sum is 49.

The square root of 9959665 is about 3155.8936927596. The cubic root of 9959665 is about 215.1534149312.

The spelling of 9959665 in words is "nine million, nine hundred fifty-nine thousand, six hundred sixty-five".