2685619709 has 2 divisors, whose sum is σ = 2685619710. Its totient is φ = 2685619708.

The previous prime is 2685619681. The next prime is 2685619777. The reversal of 2685619709 is 9079165862.

2685619709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1546219684 + 1139400025 = 39322^2 + 33755^2 .

It is a cyclic number.

It is not a de Polignac number, because 2685619709 - 2¹⁶ = 2685554173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2685619789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342809854 + 1342809855.

It is an arithmetic number, because the mean of its divisors is an integer number (1342809855).

Almost surely, 2^2685619709 is an apocalyptic number.

It is an amenable number.

2685619709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2685619709 is an equidigital number, since it uses as much as digits as its factorization.

2685619709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 2685619709 is about 51822.9650734112. The cubic root of 2685619709 is about 1390.0001223194. Note that the first 3 decimals are identical.

The spelling of 2685619709 in words is "two billion, six hundred eighty-five million, six hundred nineteen thousand, seven hundred nine".