6664958209 has 16 divisors (see below), whose sum is σ = 8238872320. Its totient is φ = 5250329280.

The previous prime is 6664958207. The next prime is 6664958213. The reversal of 6664958209 is 9028594666.

It is a happy number.

It is not a de Polignac number, because 6664958209 - 2¹ = 6664958207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6664958209.

It is not an unprimeable number, because it can be changed into a prime (6664958207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139077 + ... + 180754.

It is an arithmetic number, because the mean of its divisors is an integer number (514929520).

Almost surely, 2^6664958209 is an apocalyptic number.

It is an amenable number.

6664958209 is a deficient number, since it is larger than the sum of its proper divisors (1573914111).

6664958209 is a wasteful number, since it uses less digits than its factorization.

6664958209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320080.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The square root of 6664958209 is about 81639.1952985819. The cubic root of 6664958209 is about 1881.9112720047.

The spelling of 6664958209 in words is "six billion, six hundred sixty-four million, nine hundred fifty-eight thousand, two hundred nine".