855871018 has 8 divisors (see below), whose sum is σ = 1359324612. Its totient is φ = 402762816.

The previous prime is 855871007. The next prime is 855871021. The reversal of 855871018 is 810178558.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 707932449 + 147938569 = 26607^2 + 12163^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12586305 + ... + 12586372.

Almost surely, 2^855871018 is an apocalyptic number.

855871018 is a deficient number, since it is larger than the sum of its proper divisors (503453594).

855871018 is a wasteful number, since it uses less digits than its factorization.

855871018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25172696.

The product of its (nonzero) digits is 89600, while the sum is 43.

The square root of 855871018 is about 29255.2733366140. The cubic root of 855871018 is about 949.4441875266. Note that the first 3 decimals are identical.

The spelling of 855871018 in words is "eight hundred fifty-five million, eight hundred seventy-one thousand, eighteen".