6665061609 has 12 divisors (see below), whose sum is σ = 9722632452. Its totient is φ = 4399380000.

The previous prime is 6665061607. The next prime is 6665061629. The reversal of 6665061609 is 9061605666.

It can be written as a sum of positive squares in 2 ways, for example, as 6201090009 + 463971600 = 78747^2 + 21540^2 .

It is not a de Polignac number, because 6665061609 - 2¹ = 6665061607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6665061607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3665242 + ... + 3667059.

It is an arithmetic number, because the mean of its divisors is an integer number (810219371).

Almost surely, 2^6665061609 is an apocalyptic number.

It is an amenable number.

6665061609 is a deficient number, since it is larger than the sum of its proper divisors (3057570843).

6665061609 is a wasteful number, since it uses less digits than its factorization.

6665061609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7332408 (or 7332405 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 6665061609 is about 81639.8285703737. The cubic root of 6665061609 is about 1881.9210039296.

The spelling of 6665061609 in words is "six billion, six hundred sixty-five million, sixty-one thousand, six hundred nine".