320063929865 has 4 divisors (see below), whose sum is σ = 384076715844. Its totient is φ = 256051143888.

The previous prime is 320063929781. The next prime is 320063929877. The reversal of 320063929865 is 568929360023.

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 39870504976 + 280193424889 = 199676^2 + 529333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320063929865 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32006392982 + ... + 32006392991.

It is an arithmetic number, because the mean of its divisors is an integer number (96019178961).

Almost surely, 2^320063929865 is an apocalyptic number.

It is an amenable number.

320063929865 is a deficient number, since it is larger than the sum of its proper divisors (64012785979).

320063929865 is an equidigital number, since it uses as much as digits as its factorization.

320063929865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64012785978.

The product of its (nonzero) digits is 4199040, while the sum is 53.

The spelling of 320063929865 in words is "three hundred twenty billion, sixty-three million, nine hundred twenty-nine thousand, eight hundred sixty-five".