8509865216 has 18 divisors (see below), whose sum is σ = 16986489282. Its totient is φ = 4254932480.

The previous prime is 8509865213. The next prime is 8509865233. The reversal of 8509865216 is 6125689058.

It can be written as a sum of positive squares in only one way, i.e., 4475074816 + 4034790400 = 66896^2 + 63520^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8509865213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16620575 + ... + 16621086.

It is an arithmetic number, because the mean of its divisors is an integer number (943693849).

Almost surely, 2^8509865216 is an apocalyptic number.

It is an amenable number.

8509865216 is a deficient number, since it is larger than the sum of its proper divisors (8476624066).

8509865216 is an equidigital number, since it uses as much as digits as its factorization.

8509865216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33241677 (or 33241663 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 50.

The square root of 8509865216 is about 92248.9307038298. The cubic root of 8509865216 is about 2041.6167831418.

The spelling of 8509865216 in words is "eight billion, five hundred nine million, eight hundred sixty-five thousand, two hundred sixteen".