8666116581860 has 48 divisors (see below), whose sum is σ = 18543103815600. Its totient is φ = 3400879732224.

The previous prime is 8666116581847. The next prime is 8666116581869. The reversal of 8666116581860 is 681856116668.

It can be written as a sum of positive squares in 8 ways, for example, as 521668174756 + 8144448407104 = 722266^2 + 2853848^2 .

It is a super-2 number, since 2×8666116581860² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8666116581793 and 8666116581802.

It is not an unprimeable number, because it can be changed into a prime (8666116581869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23378846 + ... + 23746634.

It is an arithmetic number, because the mean of its divisors is an integer number (386314662825).

Almost surely, 2^{8666116581860} is an apocalyptic number.

It is an amenable number.

8666116581860 is an abundant number, since it is smaller than the sum of its proper divisors (9876987233740).

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

8666116581860 is a wasteful number, since it uses less digits than its factorization.

8666116581860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390080 (or 390078 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 62.

The spelling of 8666116581860 in words is "eight trillion, six hundred sixty-six billion, one hundred sixteen million, five hundred eighty-one thousand, eight hundred sixty".