320494388359681 has 4 divisors (see below), whose sum is σ = 320644925885700. Its totient is φ = 320343850833664.

The previous prime is 320494388359667. The next prime is 320494388359771. The reversal of 320494388359681 is 186953883494023.

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 168918499828225 + 151575888531456 = 12996865^2 + 12311616^2 .

It is a cyclic number.

It is not a de Polignac number, because 320494388359681 - 2³⁹ = 319944632545793 is a prime.

It is a super-2 number, since 2×320494388359681² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320494388359781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75268759816 + ... + 75268764073.

It is an arithmetic number, because the mean of its divisors is an integer number (80161231471425).

Almost surely, 2^{320494388359681} is an apocalyptic number.

It is an amenable number.

320494388359681 is a deficient number, since it is larger than the sum of its proper divisors (150537526019).

320494388359681 is a wasteful number, since it uses less digits than its factorization.

320494388359681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150537526018.

The product of its (nonzero) digits is 1074954240, while the sum is 73.

The spelling of 320494388359681 in words is "three hundred twenty trillion, four hundred ninety-four billion, three hundred eighty-eight million, three hundred fifty-nine thousand, six hundred eighty-one".