320546405665 has 4 divisors (see below), whose sum is σ = 384655686804. Its totient is φ = 256437124528.

The previous prime is 320546405659. The next prime is 320546405743. The reversal of 320546405665 is 566504645023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566504645023 = 18269 ⋅31009067.

It can be written as a sum of positive squares in 2 ways, for example, as 213201057169 + 107345348496 = 461737^2 + 327636^2 .

It is a cyclic number.

It is not a de Polignac number, because 320546405665 - 2¹³ = 320546397473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32054640562 + ... + 32054640571.

It is an arithmetic number, because the mean of its divisors is an integer number (96163921701).

Almost surely, 2^320546405665 is an apocalyptic number.

It is an amenable number.

320546405665 is a deficient number, since it is larger than the sum of its proper divisors (64109281139).

320546405665 is an equidigital number, since it uses as much as digits as its factorization.

320546405665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64109281138.

The product of its (nonzero) digits is 2592000, while the sum is 46.

The spelling of 320546405665 in words is "three hundred twenty billion, five hundred forty-six million, four hundred five thousand, six hundred sixty-five".