320607664717 has 4 divisors (see below), whose sum is σ = 320611807036. Its totient is φ = 320603522400.

The previous prime is 320607664697. The next prime is 320607664739. The reversal of 320607664717 is 717466706023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 717466706023 = 83 ⋅8644177181.

It can be written as a sum of positive squares in 2 ways, for example, as 170229682921 + 150377981796 = 412589^2 + 387786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320607664717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320607662717) 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, 1952808 + ... + 2110609.

It is an arithmetic number, because the mean of its divisors is an integer number (80152951759).

Almost surely, 2^320607664717 is an apocalyptic number.

It is an amenable number.

320607664717 is a deficient number, since it is larger than the sum of its proper divisors (4142319).

320607664717 is an equidigital number, since it uses as much as digits as its factorization.

320607664717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142318.

The product of its (nonzero) digits is 1778112, while the sum is 49.

The spelling of 320607664717 in words is "three hundred twenty billion, six hundred seven million, six hundred sixty-four thousand, seven hundred seventeen".