320443606985 has 8 divisors (see below), whose sum is σ = 390836137416. Its totient is φ = 252152346240.

The previous prime is 320443606961. The next prime is 320443607009. The reversal of 320443606985 is 589606344023.

It is an interprime number because it is at equal distance from previous prime (320443606961) and next prime (320443607009).

It can be written as a sum of positive squares in 4 ways, for example, as 37581311881 + 282862295104 = 193859^2 + 531848^2 .

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

It is not a de Polignac number, because 320443606985 - 2¹⁴ = 320443590601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525317084 + ... + 525317693.

It is an arithmetic number, because the mean of its divisors is an integer number (48854517177).

Almost surely, 2^320443606985 is an apocalyptic number.

It is an amenable number.

320443606985 is a deficient number, since it is larger than the sum of its proper divisors (70392530431).

320443606985 is a wasteful number, since it uses less digits than its factorization.

320443606985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050634843.

The product of its (nonzero) digits is 3732480, while the sum is 50.

The spelling of 320443606985 in words is "three hundred twenty billion, four hundred forty-three million, six hundred six thousand, nine hundred eighty-five".