855166985 has 4 divisors (see below), whose sum is σ = 1026200388. Its totient is φ = 684133584.

The previous prime is 855166973. The next prime is 855166987. The reversal of 855166985 is 589661558.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 291009481 + 564157504 = 17059^2 + 23752^2 .

It is a cyclic number.

It is not a de Polignac number, because 855166985 - 2¹⁶ = 855101449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855166987) by changing a digit.

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, 85516694 + ... + 85516703.

It is an arithmetic number, because the mean of its divisors is an integer number (256550097).

Almost surely, 2^855166985 is an apocalyptic number.

It is an amenable number.

855166985 is a deficient number, since it is larger than the sum of its proper divisors (171033403).

855166985 is a wasteful number, since it uses less digits than its factorization.

855166985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171033402.

The product of its digits is 2592000, while the sum is 53.

The square root of 855166985 is about 29243.2382782755. The cubic root of 855166985 is about 949.1837809178.

The spelling of 855166985 in words is "eight hundred fifty-five million, one hundred sixty-six thousand, nine hundred eighty-five".