320523555445 has 4 divisors (see below), whose sum is σ = 384628266540. Its totient is φ = 256418844352.

The previous prime is 320523555377. The next prime is 320523555463. The reversal of 320523555445 is 544555325023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544555325023 = 733 ⋅742913131.

It can be written as a sum of positive squares in 2 ways, for example, as 208715577316 + 111807978129 = 456854^2 + 334377^2 .

It is a cyclic number.

It is not a de Polignac number, because 320523555445 - 2¹⁷ = 320523424373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32052355540 + ... + 32052355549.

It is an arithmetic number, because the mean of its divisors is an integer number (96157066635).

Almost surely, 2^320523555445 is an apocalyptic number.

It is an amenable number.

320523555445 is a deficient number, since it is larger than the sum of its proper divisors (64104711095).

320523555445 is an equidigital number, since it uses as much as digits as its factorization.

320523555445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64104711094.

The product of its (nonzero) digits is 1800000, while the sum is 43.

The spelling of 320523555445 in words is "three hundred twenty billion, five hundred twenty-three million, five hundred fifty-five thousand, four hundred forty-five".