320872799521 has 2 divisors, whose sum is σ = 320872799522. Its totient is φ = 320872799520.

The previous prime is 320872799519. The next prime is 320872799549. The reversal of 320872799521 is 125997278023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236721171600 + 84151627921 = 486540^2 + 290089^2 .

It is a cyclic number.

It is not a de Polignac number, because 320872799521 - 2¹ = 320872799519 is a prime.

Together with 320872799519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (320872799581) by changing a digit.

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 as a sum of consecutive naturals, namely, 160436399760 + 160436399761.

It is an arithmetic number, because the mean of its divisors is an integer number (160436399761).

Almost surely, 2^320872799521 is an apocalyptic number.

It is an amenable number.

320872799521 is a deficient number, since it is larger than the sum of its proper divisors (1).

320872799521 is an equidigital number, since it uses as much as digits as its factorization.

320872799521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 320872799521 in words is "three hundred twenty billion, eight hundred seventy-two million, seven hundred ninety-nine thousand, five hundred twenty-one".