665650665005 has 8 divisors (see below), whose sum is σ = 798850977912. Its totient is φ = 532473745408.

The previous prime is 665650664969. The next prime is 665650665023. The reversal of 665650665005 is 500566056566.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 188061862921 + 477588802084 = 433661^2 + 691078^2 .

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 665650665005 - 2⁶ = 665650664941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5785664 + ... + 5899593.

It is an arithmetic number, because the mean of its divisors is an integer number (99856372239).

Almost surely, 2^665650665005 is an apocalyptic number.

It is an amenable number.

665650665005 is a deficient number, since it is larger than the sum of its proper divisors (133200312907).

665650665005 is a wasteful number, since it uses less digits than its factorization.

665650665005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11696655.

The product of its (nonzero) digits is 4860000, while the sum is 50.

The spelling of 665650665005 in words is "six hundred sixty-five billion, six hundred fifty million, six hundred sixty-five thousand, five".