320065643 has 2 divisors, whose sum is σ = 320065644. Its totient is φ = 320065642.

The previous prime is 320065601. The next prime is 320065661. The reversal of 320065643 is 346560023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320065643 - 2¹⁸ = 319803499 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320065673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160032821 + 160032822.

It is an arithmetic number, because the mean of its divisors is an integer number (160032822).

Almost surely, 2^320065643 is an apocalyptic number.

320065643 is a deficient number, since it is larger than the sum of its proper divisors (1).

320065643 is an equidigital number, since it uses as much as digits as its factorization.

320065643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 320065643 is about 17890.3785035421. The cubic root of 320065643 is about 684.0371454526.

The spelling of 320065643 in words is "three hundred twenty million, sixty-five thousand, six hundred forty-three".