166665206 has 16 divisors (see below), whose sum is σ = 256873680. Its totient is φ = 81070080.

The previous prime is 166665203. The next prime is 166665281. The reversal of 166665206 is 602566661.

It is a self number, because there is not a number n which added to its sum of digits gives 166665206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166665203) 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 7 ways as a sum of consecutive naturals, for example, 4166 + ... + 18726.

It is an arithmetic number, because the mean of its divisors is an integer number (16054605).

Almost surely, 2^166665206 is an apocalyptic number.

166665206 is a deficient number, since it is larger than the sum of its proper divisors (90208474).

166665206 is a wasteful number, since it uses less digits than its factorization.

166665206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14719.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 166665206 is about 12909.8879158574. The cubic root of 166665206 is about 550.3196004727.

The spelling of 166665206 in words is "one hundred sixty-six million, six hundred sixty-five thousand, two hundred six".