320485615309 has 2 divisors, whose sum is σ = 320485615310. Its totient is φ = 320485615308.

The previous prime is 320485615237. The next prime is 320485615399. The reversal of 320485615309 is 903516584023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180452491209 + 140033124100 = 424797^2 + 374210^2 .

It is a cyclic number.

It is not a de Polignac number, because 320485615309 - 2²⁹ = 319948744397 is a prime.

It is a super-2 number, since 2×320485615309² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320485615399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160242807654 + 160242807655.

It is an arithmetic number, because the mean of its divisors is an integer number (160242807655).

Almost surely, 2^320485615309 is an apocalyptic number.

It is an amenable number.

320485615309 is a deficient number, since it is larger than the sum of its proper divisors (1).

320485615309 is an equidigital number, since it uses as much as digits as its factorization.

320485615309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 320485615309 in words is "three hundred twenty billion, four hundred eighty-five million, six hundred fifteen thousand, three hundred nine".