850818505 has 4 divisors (see below), whose sum is σ = 1020982212. Its totient is φ = 680654800.

The previous prime is 850818503. The next prime is 850818571. The reversal of 850818505 is 505818058.

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 178142409 + 672676096 = 13347^2 + 25936^2 .

It is not a de Polignac number, because 850818505 - 2¹ = 850818503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (850818503) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 85081846 + ... + 85081855.

It is an arithmetic number, because the mean of its divisors is an integer number (255245553).

Almost surely, 2^850818505 is an apocalyptic number.

It is an amenable number.

850818505 is a deficient number, since it is larger than the sum of its proper divisors (170163707).

850818505 is a wasteful number, since it uses less digits than its factorization.

850818505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170163706.

The product of its (nonzero) digits is 64000, while the sum is 40.

The square root of 850818505 is about 29168.7933415148. The cubic root of 850818505 is about 947.5721960290.

The spelling of 850818505 in words is "eight hundred fifty million, eight hundred eighteen thousand, five hundred five".