9656579561 has 4 divisors (see below), whose sum is σ = 9661248900. Its totient is φ = 9651910224.

The previous prime is 9656579519. The next prime is 9656579579. The reversal of 9656579561 is 1659756569.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1659756569 = 1093 ⋅1518533.

It can be written as a sum of positive squares in 2 ways, for example, as 4767073936 + 4889505625 = 69044^2 + 69925^2 .

It is a cyclic number.

It is not a de Polignac number, because 9656579561 - 2²² = 9652385257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9656579561.

It is not an unprimeable number, because it can be changed into a prime (9656573561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2331566 + ... + 2335703.

It is an arithmetic number, because the mean of its divisors is an integer number (2415312225).

Almost surely, 2^9656579561 is an apocalyptic number.

It is an amenable number.

9656579561 is a deficient number, since it is larger than the sum of its proper divisors (4669339).

9656579561 is a wasteful number, since it uses less digits than its factorization.

9656579561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4669338.

The product of its digits is 15309000, while the sum is 59.

The square root of 9656579561 is about 98267.8968992417. The cubic root of 9656579561 is about 2129.4842926294.

The spelling of 9656579561 in words is "nine billion, six hundred fifty-six million, five hundred seventy-nine thousand, five hundred sixty-one".