309668855369 has 2 divisors, whose sum is σ = 309668855370. Its totient is φ = 309668855368.

The previous prime is 309668855359. The next prime is 309668855381. The reversal of 309668855369 is 963558866903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190514790400 + 119154064969 = 436480^2 + 345187^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309668855369 is a prime.

It is a super-2 number, since 2×309668855369² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 309668855299 and 309668855308.

It is not a weakly prime, because it can be changed into another prime (309668855359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154834427684 + 154834427685.

It is an arithmetic number, because the mean of its divisors is an integer number (154834427685).

Almost surely, 2^309668855369 is an apocalyptic number.

It is an amenable number.

309668855369 is a deficient number, since it is larger than the sum of its proper divisors (1).

309668855369 is an equidigital number, since it uses as much as digits as its factorization.

309668855369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 251942400, while the sum is 68.

The spelling of 309668855369 in words is "three hundred nine billion, six hundred sixty-eight million, eight hundred fifty-five thousand, three hundred sixty-nine".