9689816445409 has 9 divisors (see below), whose sum is σ = 9958899775251. Its totient is φ = 9427817451960.

The previous prime is 9689816445343. The next prime is 9689816445481. The reversal of 9689816445409 is 9045446189869.

The square root of 9689816445409 is 3112847.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8670580822225 + 1019235623184 = 2944585^2 + 1009572^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9689816445409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9689816445499) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 115133274 + ... + 115217404.

Almost surely, 2^{9689816445409} is an apocalyptic number.

9689816445409 is the 3112847-th square number.

9689816445409 is the 1556424-th centered octagonal number.

It is an amenable number.

9689816445409 is a deficient number, since it is larger than the sum of its proper divisors (269083329842).

9689816445409 is an frugal number, since it uses more digits than its factorization.

9689816445409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168336 (or 84168 counting only the distinct ones).

The product of its (nonzero) digits is 537477120, while the sum is 73.

The spelling of 9689816445409 in words is "nine trillion, six hundred eighty-nine billion, eight hundred sixteen million, four hundred forty-five thousand, four hundred nine".