2685568309 has 2 divisors, whose sum is σ = 2685568310. Its totient is φ = 2685568308.

The previous prime is 2685568267. The next prime is 2685568321. The reversal of 2685568309 is 9038655862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2671856100 + 13712209 = 51690^2 + 3703^2 .

It is a cyclic number.

It is not a de Polignac number, because 2685568309 - 2¹³ = 2685560117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2685568399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342784154 + 1342784155.

It is an arithmetic number, because the mean of its divisors is an integer number (1342784155).

Almost surely, 2^2685568309 is an apocalyptic number.

It is an amenable number.

2685568309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2685568309 is an equidigital number, since it uses as much as digits as its factorization.

2685568309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The square root of 2685568309 is about 51822.4691519036. The cubic root of 2685568309 is about 1389.9912545384.

The spelling of 2685568309 in words is "two billion, six hundred eighty-five million, five hundred sixty-eight thousand, three hundred nine".