666165050 has 24 divisors (see below), whose sum is σ = 1243698300. Its totient is φ = 265470080.

The previous prime is 666165041. The next prime is 666165053. The reversal of 666165050 is 50561666.

It can be written as a sum of positive squares in 6 ways, for example, as 5726449 + 660438601 = 2393^2 + 25699^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 666165050.

It is not an unprimeable number, because it can be changed into a prime (666165053) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 11315 + ... + 38214.

Almost surely, 2^666165050 is an apocalyptic number.

666165050 is a deficient number, since it is larger than the sum of its proper divisors (577533250).

666165050 is a wasteful number, since it uses less digits than its factorization.

666165050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49810 (or 49805 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 666165050 is about 25810.1733818276. The cubic root of 666165050 is about 873.3613085005.

The spelling of 666165050 in words is "six hundred sixty-six million, one hundred sixty-five thousand, fifty".