8216865161 has 4 divisors (see below), whose sum is σ = 8574120192. Its totient is φ = 7859610132.

The previous prime is 8216865143. The next prime is 8216865199. The reversal of 8216865161 is 1615686128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8216865161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8216865101) 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 in 3 ways as a sum of consecutive naturals, for example, 178627481 + ... + 178627526.

It is an arithmetic number, because the mean of its divisors is an integer number (2143530048).

Almost surely, 2^8216865161 is an apocalyptic number.

It is an amenable number.

8216865161 is a deficient number, since it is larger than the sum of its proper divisors (357255031).

8216865161 is a wasteful number, since it uses less digits than its factorization.

8216865161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357255030.

The product of its digits is 138240, while the sum is 44.

The square root of 8216865161 is about 90646.9258221149. The cubic root of 8216865161 is about 2017.9112121461.

The spelling of 8216865161 in words is "eight billion, two hundred sixteen million, eight hundred sixty-five thousand, one hundred sixty-one".