320520551443 has 2 divisors, whose sum is σ = 320520551444. Its totient is φ = 320520551442.

The previous prime is 320520551431. The next prime is 320520551497. The reversal of 320520551443 is 344155025023.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320520551443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320520551399 and 320520551408.

It is not a weakly prime, because it can be changed into another prime (320520581443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160260275721 + 160260275722.

It is an arithmetic number, because the mean of its divisors is an integer number (160260275722).

Almost surely, 2^320520551443 is an apocalyptic number.

320520551443 is a deficient number, since it is larger than the sum of its proper divisors (1).

320520551443 is an equidigital number, since it uses as much as digits as its factorization.

320520551443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 320520551443 its reverse (344155025023), we get a palindrome (664675576466).

The spelling of 320520551443 in words is "three hundred twenty billion, five hundred twenty million, five hundred fifty-one thousand, four hundred forty-three".