808844812165 has 16 divisors (see below), whose sum is σ = 1045364222448. Its totient is φ = 597250584576.

The previous prime is 808844812141. The next prime is 808844812169. The reversal of 808844812165 is 561218448808.

It is a Cunningham number, because it is equal to 899358²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 148145700609 + 660699111556 = 384897^2 + 812834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-808844812165 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808844812169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265509 + ... + 1299301.

It is an arithmetic number, because the mean of its divisors is an integer number (65335263903).

Almost surely, 2^808844812165 is an apocalyptic number.

It is an amenable number.

808844812165 is a deficient number, since it is larger than the sum of its proper divisors (236519410283).

808844812165 is a wasteful number, since it uses less digits than its factorization.

808844812165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045848.

The product of its (nonzero) digits is 3932160, while the sum is 55.

The spelling of 808844812165 in words is "eight hundred eight billion, eight hundred forty-four million, eight hundred twelve thousand, one hundred sixty-five".