8159822785 has 12 divisors (see below), whose sum is σ = 9811206972. Its totient is φ = 6514926528.

The previous prime is 8159822777. The next prime is 8159822849. The reversal of 8159822785 is 5872289518.

It can be written as a sum of positive squares in 6 ways, for example, as 674804529 + 7485018256 = 25977^2 + 86516^2 .

It is not a de Polignac number, because 8159822785 - 2³ = 8159822777 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5615119 + ... + 5616571.

It is an arithmetic number, because the mean of its divisors is an integer number (817600581).

Almost surely, 2^8159822785 is an apocalyptic number.

It is an amenable number.

8159822785 is a deficient number, since it is larger than the sum of its proper divisors (1651384187).

8159822785 is an frugal number, since it uses more digits than its factorization.

8159822785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3684 (or 2231 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 55.

The square root of 8159822785 is about 90331.7374182518. The cubic root of 8159822785 is about 2013.2308447791.

The spelling of 8159822785 in words is "eight billion, one hundred fifty-nine million, eight hundred twenty-two thousand, seven hundred eighty-five".