665682709 has 8 divisors (see below), whose sum is σ = 677306880. Its totient is φ = 654150816.

The previous prime is 665682707. The next prime is 665682751. The reversal of 665682709 is 907286566.

It is a happy number.

665682709 is digitally balanced in base 2, 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 665682709 - 2¹ = 665682707 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 (665682707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8437 + ... + 37450.

It is an arithmetic number, because the mean of its divisors is an integer number (84663360).

Almost surely, 2^665682709 is an apocalyptic number.

It is an amenable number.

665682709 is a deficient number, since it is larger than the sum of its proper divisors (11624171).

665682709 is a wasteful number, since it uses less digits than its factorization.

665682709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46139.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 665682709 is about 25800.8276805222. The cubic root of 665682709 is about 873.1504700207.

The spelling of 665682709 in words is "six hundred sixty-five million, six hundred eighty-two thousand, seven hundred nine".