320439572809 has 4 divisors (see below), whose sum is σ = 320522742916. Its totient is φ = 320356402704.

The previous prime is 320439572807. The next prime is 320439572821. The reversal of 320439572809 is 908275934023.

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 198256467600 + 122183105209 = 445260^2 + 349547^2 .

It is a cyclic number.

It is not a de Polignac number, because 320439572809 - 2¹ = 320439572807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320439572807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41579274 + ... + 41586979.

It is an arithmetic number, because the mean of its divisors is an integer number (80130685729).

Almost surely, 2^320439572809 is an apocalyptic number.

It is an amenable number.

320439572809 is a deficient number, since it is larger than the sum of its proper divisors (83170107).

320439572809 is an equidigital number, since it uses as much as digits as its factorization.

320439572809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83170106.

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 320439572809 in words is "three hundred twenty billion, four hundred thirty-nine million, five hundred seventy-two thousand, eight hundred nine".