666602065205 has 8 divisors (see below), whose sum is σ = 808910371800. Its totient is φ = 527289723136.

The previous prime is 666602065159. The next prime is 666602065253. The reversal of 666602065205 is 502560206666.

It can be written as a sum of positive squares in 4 ways, for example, as 21486282724 + 645115782481 = 146582^2 + 803191^2 .

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 666602065205 - 2⁶ = 666602065141 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 748990640 + ... + 748991529.

It is an arithmetic number, because the mean of its divisors is an integer number (101113796475).

Almost surely, 2^666602065205 is an apocalyptic number.

It is an amenable number.

666602065205 is a deficient number, since it is larger than the sum of its proper divisors (142308306595).

666602065205 is a wasteful number, since it uses less digits than its factorization.

666602065205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497982263.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 666602065205 in words is "six hundred sixty-six billion, six hundred two million, sixty-five thousand, two hundred five".