320541646236505 has 4 divisors (see below), whose sum is σ = 384649975483812. Its totient is φ = 256433316989200.

The previous prime is 320541646236499. The next prime is 320541646236509. The reversal of 320541646236505 is 505632646145023.

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 120449220204096 + 200092426032409 = 10974936^2 + 14145403^2 .

It is not a de Polignac number, because 320541646236505 - 2¹¹ = 320541646234457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320541646236509) 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, 32054164623646 + ... + 32054164623655.

It is an arithmetic number, because the mean of its divisors is an integer number (96162493870953).

Almost surely, 2^{320541646236505} is an apocalyptic number.

It is an amenable number.

320541646236505 is a deficient number, since it is larger than the sum of its proper divisors (64108329247307).

320541646236505 is an equidigital number, since it uses as much as digits as its factorization.

320541646236505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64108329247306.

The product of its (nonzero) digits is 15552000, while the sum is 52.

The spelling of 320541646236505 in words is "three hundred twenty trillion, five hundred forty-one billion, six hundred forty-six million, two hundred thirty-six thousand, five hundred five".