665009683 has 4 divisors (see below), whose sum is σ = 716164288. Its totient is φ = 613855080.

The previous prime is 665009669. The next prime is 665009687. The reversal of 665009683 is 386900566.

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 665009683 - 2⁹ = 665009171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665009687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25577283 + ... + 25577308.

It is an arithmetic number, because the mean of its divisors is an integer number (179041072).

Almost surely, 2^665009683 is an apocalyptic number.

665009683 is a deficient number, since it is larger than the sum of its proper divisors (51154605).

665009683 is a wasteful number, since it uses less digits than its factorization.

665009683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51154604.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 665009683 is about 25787.7816610890. The cubic root of 665009683 is about 872.8561100016.

The spelling of 665009683 in words is "six hundred sixty-five million, nine thousand, six hundred eighty-three".