2659642209 has 20 divisors (see below), whose sum is σ = 4540624704. Its totient is φ = 1519795224.

The previous prime is 2659642169. The next prime is 2659642213. The reversal of 2659642209 is 9022469562.

It is not a de Polignac number, because 2659642209 - 2⁹ = 2659641697 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2659642259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2344797 + ... + 2345930.

Almost surely, 2^2659642209 is an apocalyptic number.

It is an amenable number.

2659642209 is a deficient number, since it is larger than the sum of its proper divisors (1880982495).

2659642209 is an equidigital number, since it uses as much as digits as its factorization.

2659642209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4690746 (or 4690737 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 2659642209 is about 51571.7190812949. The cubic root of 2659642209 is about 1385.5038562625.

The spelling of 2659642209 in words is "two billion, six hundred fifty-nine million, six hundred forty-two thousand, two hundred nine".