8766665820 has 72 divisors (see below), whose sum is σ = 29009700720. Its totient is φ = 2125251840.

The previous prime is 8766665783. The next prime is 8766665851. The reversal of 8766665820 is 285666678.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2211825 + ... + 2215784.

It is an arithmetic number, because the mean of its divisors is an integer number (402912510).

Almost surely, 2^8766665820 is an apocalyptic number.

It is an amenable number.

8766665820 is an abundant number, since it is smaller than the sum of its proper divisors (20243034900).

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

8766665820 is a wasteful number, since it uses less digits than its factorization.

8766665820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4427635 (or 4427630 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The square root of 8766665820 is about 93630.4748466011. The cubic root of 8766665820 is about 2061.9500982472.

It can be divided in two parts, 87666658 and 20, that added together give a palindrome (87666678).

The spelling of 8766665820 in words is "eight billion, seven hundred sixty-six million, six hundred sixty-five thousand, eight hundred twenty".