6665793439 has 4 divisors (see below), whose sum is σ = 6666100624. Its totient is φ = 6665486256.

The previous prime is 6665793437. The next prime is 6665793443. The reversal of 6665793439 is 9343975666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6665793439 - 2¹ = 6665793437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665793437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118347 + ... + 165340.

It is an arithmetic number, because the mean of its divisors is an integer number (1666525156).

Almost surely, 2^6665793439 is an apocalyptic number.

6665793439 is a deficient number, since it is larger than the sum of its proper divisors (307185).

6665793439 is a wasteful number, since it uses less digits than its factorization.

6665793439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307184.

The product of its digits is 22044960, while the sum is 58.

The square root of 6665793439 is about 81644.3105121233. The cubic root of 6665793439 is about 1881.9898803044.

The spelling of 6665793439 in words is "six billion, six hundred sixty-five million, seven hundred ninety-three thousand, four hundred thirty-nine".