666605106065 has 8 divisors (see below), whose sum is σ = 799940195880. Its totient is φ = 533274705792.

The previous prime is 666605106053. The next prime is 666605106107. The reversal of 666605106065 is 560601506666.

It can be written as a sum of positive squares in 4 ways, for example, as 17254398736 + 649350707329 = 131356^2 + 805823^2 .

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 666605106065 - 2⁴ = 666605106049 is a prime.

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, 851684 + ... + 1434773.

It is an arithmetic number, because the mean of its divisors is an integer number (99992524485).

Almost surely, 2^666605106065 is an apocalyptic number.

It is an amenable number.

666605106065 is a deficient number, since it is larger than the sum of its proper divisors (133335089815).

666605106065 is a wasteful number, since it uses less digits than its factorization.

666605106065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344771.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 666605106065 in words is "six hundred sixty-six billion, six hundred five million, one hundred six thousand, sixty-five".