815163165 has 12 divisors (see below), whose sum is σ = 1412949564. Its totient is φ = 434753664.

The previous prime is 815163157. The next prime is 815163199. The reversal of 815163165 is 561361518.

815163165 is a `hidden beast` number, since 8 + 15 + 1 + 631 + 6 + 5 = 666.

815163165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 463713156 + 351450009 = 21534^2 + 18747^2 .

It is not a de Polignac number, because 815163165 - 2³ = 815163157 is a prime.

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, 9057324 + ... + 9057413.

It is an arithmetic number, because the mean of its divisors is an integer number (117745797).

Almost surely, 2^815163165 is an apocalyptic number.

It is an amenable number.

815163165 is a deficient number, since it is larger than the sum of its proper divisors (597786399).

815163165 is a wasteful number, since it uses less digits than its factorization.

815163165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18114748 (or 18114745 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 815163165 is about 28551.0624145582. The cubic root of 815163165 is about 934.1461945621.

It can be divided in two parts, 81516 and 3165, that added together give a square (84681 = 291²).

The spelling of 815163165 in words is "eight hundred fifteen million, one hundred sixty-three thousand, one hundred sixty-five".