6665999999 has 8 divisors (see below), whose sum is σ = 7143156720. Its totient is φ = 6198292096.

The previous prime is 6665999993. The next prime is 6666000017. The reversal of 6665999999 is 9999995666.

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 6665999999 - 2¹⁶ = 6665934463 is a prime.

It is a Duffinian number.

6665999999 is a modest number, since divided by 99999 gives 66659 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665999993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2360744 + ... + 2363565.

It is an arithmetic number, because the mean of its divisors is an integer number (892894590).

Almost surely, 2^6665999999 is an apocalyptic number.

6665999999 is a deficient number, since it is larger than the sum of its proper divisors (477156721).

6665999999 is a wasteful number, since it uses less digits than its factorization.

6665999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4724409.

The product of its digits is 573956280, while the sum is 77.

The square root of 6665999999 is about 81645.5755016768. The cubic root of 6665999999 is about 1882.0093198414.

The spelling of 6665999999 in words is "six billion, six hundred sixty-five million, nine hundred ninety-nine thousand, nine hundred ninety-nine".