855818165 has 8 divisors (see below), whose sum is σ = 1087392600. Its totient is φ = 644380672.

The previous prime is 855818143. The next prime is 855818203. The reversal of 855818165 is 561818558.

It can be written as a sum of positive squares in 4 ways, for example, as 370100644 + 485717521 = 19238^2 + 22039^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 855818165 - 2¹⁶ = 855752629 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5034140 + ... + 5034309.

It is an arithmetic number, because the mean of its divisors is an integer number (135924075).

Almost surely, 2^855818165 is an apocalyptic number.

855818165 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

855818165 is a deficient number, since it is larger than the sum of its proper divisors (231574435).

855818165 is a wasteful number, since it uses less digits than its factorization.

855818165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10068471.

The product of its digits is 384000, while the sum is 47.

The square root of 855818165 is about 29254.3700154353. The cubic root of 855818165 is about 949.4246433019.

The spelling of 855818165 in words is "eight hundred fifty-five million, eight hundred eighteen thousand, one hundred sixty-five".