2688166609 has 2 divisors, whose sum is σ = 2688166610. Its totient is φ = 2688166608.

The previous prime is 2688166597. The next prime is 2688166669. The reversal of 2688166609 is 9066618862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1907243584 + 780923025 = 43672^2 + 27945^2 .

It is a cyclic number.

It is not a de Polignac number, because 2688166609 - 2⁹ = 2688166097 is a prime.

It is not a weakly prime, because it can be changed into another prime (2688166669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344083304 + 1344083305.

It is an arithmetic number, because the mean of its divisors is an integer number (1344083305).

Almost surely, 2^2688166609 is an apocalyptic number.

It is an amenable number.

2688166609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2688166609 is an equidigital number, since it uses as much as digits as its factorization.

2688166609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The square root of 2688166609 is about 51847.5323327929. The cubic root of 2688166609 is about 1390.4393844108.

The spelling of 2688166609 in words is "two billion, six hundred eighty-eight million, one hundred sixty-six thousand, six hundred nine".