6665987707 has 8 divisors (see below), whose sum is σ = 6777604400. Its totient is φ = 6554446560.

The previous prime is 6665987677. The next prime is 6665987711. The reversal of 6665987707 is 7077895666.

6665987707 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6665987707 - 2¹¹ = 6665985659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6665987717) 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, 175669 + ... + 210217.

It is an arithmetic number, because the mean of its divisors is an integer number (847200550).

Almost surely, 2^6665987707 is an apocalyptic number.

6665987707 is a deficient number, since it is larger than the sum of its proper divisors (111616693).

6665987707 is a wasteful number, since it uses less digits than its factorization.

6665987707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37773.

The product of its (nonzero) digits is 26671680, while the sum is 61.

The square root of 6665987707 is about 81645.5002250583. The cubic root of 6665987707 is about 1882.0081630421.

The spelling of 6665987707 in words is "six billion, six hundred sixty-five million, nine hundred eighty-seven thousand, seven hundred seven".