320660819 has 2 divisors, whose sum is σ = 320660820. Its totient is φ = 320660818.

The previous prime is 320660797. The next prime is 320660849. The reversal of 320660819 is 918066023.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320660819 is a prime.

It is a super-2 number, since 2×320660819² = 205646721683501522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320660849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160330409 + 160330410.

It is an arithmetic number, because the mean of its divisors is an integer number (160330410).

Almost surely, 2^320660819 is an apocalyptic number.

320660819 is a deficient number, since it is larger than the sum of its proper divisors (1).

320660819 is an equidigital number, since it uses as much as digits as its factorization.

320660819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 320660819 is about 17907.0047467465. The cubic root of 320660819 is about 684.4608818614.

The spelling of 320660819 in words is "three hundred twenty million, six hundred sixty thousand, eight hundred nineteen".