9661580784 has 30 divisors (see below), whose sum is σ = 27039007736. Its totient is φ = 3220526880.

The previous prime is 9661580771. The next prime is 9661580801. The reversal of 9661580784 is 4870851669.

It is a super-2 number, since 2×9661580784² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9661580784.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33547012 + ... + 33547299.

Almost surely, 2^9661580784 is an apocalyptic number.

It is an amenable number.

9661580784 is an abundant number, since it is smaller than the sum of its proper divisors (17377426952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9661580784 is a wasteful number, since it uses less digits than its factorization.

9661580784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67094325 (or 67094316 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 9661580784 is about 98293.3404865253. The cubic root of 9661580784 is about 2129.8518550671.

The spelling of 9661580784 in words is "nine billion, six hundred sixty-one million, five hundred eighty thousand, seven hundred eighty-four".