9665681 has 8 divisors (see below), whose sum is σ = 10177920. Its totient is φ = 9161152.

The previous prime is 9665657. The next prime is 9665701. The reversal of 9665681 is 1865669.

9665681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9665681 - 2²² = 5471377 is a prime.

It is a super-2 number, since 2×9665681² = 186850778387522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9665641) 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, 740 + ... + 4458.

It is an arithmetic number, because the mean of its divisors is an integer number (1272240).

Almost surely, 2^9665681 is an apocalyptic number.

It is an amenable number.

9665681 is a deficient number, since it is larger than the sum of its proper divisors (512239).

9665681 is a wasteful number, since it uses less digits than its factorization.

9665681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855.

The product of its digits is 77760, while the sum is 41.

The square root of 9665681 is about 3108.9678351504. The cubic root of 9665681 is about 213.0153103823.

The spelling of 9665681 in words is "nine million, six hundred sixty-five thousand, six hundred eighty-one".