320785530521 has 2 divisors, whose sum is σ = 320785530522. Its totient is φ = 320785530520.

The previous prime is 320785530497. The next prime is 320785530523. The reversal of 320785530521 is 125035587023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320202066496 + 583464025 = 565864^2 + 24155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320785530521 is a prime.

Together with 320785530523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320785530523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160392765260 + 160392765261.

It is an arithmetic number, because the mean of its divisors is an integer number (160392765261).

Almost surely, 2^320785530521 is an apocalyptic number.

It is an amenable number.

320785530521 is a deficient number, since it is larger than the sum of its proper divisors (1).

320785530521 is an equidigital number, since it uses as much as digits as its factorization.

320785530521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 320785530521 in words is "three hundred twenty billion, seven hundred eighty-five million, five hundred thirty thousand, five hundred twenty-one".