8666804520 has 256 divisors, whose sum is σ = 32369068800. Its totient is φ = 2044154880.

The previous prime is 8666804513. The next prime is 8666804521. The reversal of 8666804520 is 254086668.

It is a super-2 number, since 2×8666804520² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (8666804521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 429702 + ... + 449418.

It is an arithmetic number, because the mean of its divisors is an integer number (126441675).

Almost surely, 2^8666804520 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 8666804520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16184534400).

8666804520 is an abundant number, since it is smaller than the sum of its proper divisors (23702264280).

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

8666804520 is a wasteful number, since it uses less digits than its factorization.

8666804520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19785 (or 19775 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 8666804520 is about 93095.6740133504. The cubic root of 8666804520 is about 2054.0909400297.

The spelling of 8666804520 in words is "eight billion, six hundred sixty-six million, eight hundred four thousand, five hundred twenty".