850557985 has 4 divisors (see below), whose sum is σ = 1020669588. Its totient is φ = 680446384.

The previous prime is 850557977. The next prime is 850558063. The reversal of 850557985 is 589755058.

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 375274384 + 475283601 = 19372^2 + 21801^2 .

It is a cyclic number.

It is not a de Polignac number, because 850557985 - 2³ = 850557977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85055794 + ... + 85055803.

It is an arithmetic number, because the mean of its divisors is an integer number (255167397).

Almost surely, 2^850557985 is an apocalyptic number.

It is an amenable number.

850557985 is a deficient number, since it is larger than the sum of its proper divisors (170111603).

850557985 is a wasteful number, since it uses less digits than its factorization.

850557985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170111602.

The product of its (nonzero) digits is 2520000, while the sum is 52.

The square root of 850557985 is about 29164.3272680856. The cubic root of 850557985 is about 947.4754708529.

The spelling of 850557985 in words is "eight hundred fifty million, five hundred fifty-seven thousand, nine hundred eighty-five".