8161015325825 has 6 divisors (see below), whose sum is σ = 10119659004054. Its totient is φ = 6528812260640.

The previous prime is 8161015325779. The next prime is 8161015325851. The reversal of 8161015325825 is 5285235101618.

It can be written as a sum of positive squares in 3 ways, for example, as 170013554929 + 7991001770896 = 412327^2 + 2826836^2 .

It is not a de Polignac number, because 8161015325825 - 2¹⁰ = 8161015324801 is a prime.

It is a super-2 number, since 2×8161015325825² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8161015325825.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163220306492 + ... + 163220306541.

It is an arithmetic number, because the mean of its divisors is an integer number (1686609834009).

Almost surely, 2^{8161015325825} is an apocalyptic number.

It is an amenable number.

8161015325825 is a deficient number, since it is larger than the sum of its proper divisors (1958643678229).

8161015325825 is a wasteful number, since it uses less digits than its factorization.

8161015325825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326440613043 (or 326440613038 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 47.

The spelling of 8161015325825 in words is "eight trillion, one hundred sixty-one billion, fifteen million, three hundred twenty-five thousand, eight hundred twenty-five".