6665919539 has 8 divisors (see below), whose sum is σ = 6733329120. Its totient is φ = 6598782016.

The previous prime is 6665919529. The next prime is 6665919569. The reversal of 6665919539 is 9359195666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6665919539 - 2²⁸ = 6397484083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6665919529) 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 7 ways as a sum of consecutive naturals, for example, 18584 + ... + 116949.

It is an arithmetic number, because the mean of its divisors is an integer number (841666140).

Almost surely, 2^6665919539 is an apocalyptic number.

6665919539 is a deficient number, since it is larger than the sum of its proper divisors (67409581).

6665919539 is a wasteful number, since it uses less digits than its factorization.

6665919539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136029.

The product of its digits is 11809800, while the sum is 59.

The square root of 6665919539 is about 81645.0827606905. The cubic root of 6665919539 is about 1882.0017477302.

The spelling of 6665919539 in words is "six billion, six hundred sixty-five million, nine hundred nineteen thousand, five hundred thirty-nine".