8666560784520 has 1024 divisors, whose sum is σ = 30795448320000. Its totient is φ = 2165128704000.

The previous prime is 8666560784507. The next prime is 8666560784533. The reversal of 8666560784520 is 254870656668.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8666560784507) and next prime (8666560784533).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 51895573477 + ... + 51895573643.

It is an arithmetic number, because the mean of its divisors is an integer number (30073680000).

Almost surely, 2^{8666560784520} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8666560784520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15397724160000).

8666560784520 is an abundant number, since it is smaller than the sum of its proper divisors (22128887535480).

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

8666560784520 is a wasteful number, since it uses less digits than its factorization.

8666560784520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 116121600, while the sum is 63.

The spelling of 8666560784520 in words is "eight trillion, six hundred sixty-six billion, five hundred sixty million, seven hundred eighty-four thousand, five hundred twenty".