665550005 has 16 divisors (see below), whose sum is σ = 828776448. Its totient is φ = 512544000.

The previous prime is 665549987. The next prime is 665550013. The reversal of 665550005 is 500055566.

It is not a de Polignac number, because 665550005 - 2¹⁰ = 665548981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18365 + ... + 40845.

It is an arithmetic number, because the mean of its divisors is an integer number (51798528).

Almost surely, 2^665550005 is an apocalyptic number.

It is an amenable number.

665550005 is a deficient number, since it is larger than the sum of its proper divisors (163226443).

665550005 is a wasteful number, since it uses less digits than its factorization.

665550005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22708.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 665550005 is about 25798.2558518982. The cubic root of 665550005 is about 873.0924452496.

The spelling of 665550005 in words is "six hundred sixty-five million, five hundred fifty thousand, five".