166665059 has 32 divisors (see below), whose sum is σ = 202357440. Its totient is φ = 135475200.

The previous prime is 166665043. The next prime is 166665089. The reversal of 166665059 is 950566661.

It is a cyclic number.

It is not a de Polignac number, because 166665059 - 2⁴ = 166665043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166665089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 395669 + ... + 396089.

It is an arithmetic number, because the mean of its divisors is an integer number (6323670).

Almost surely, 2^166665059 is an apocalyptic number.

166665059 is a deficient number, since it is larger than the sum of its proper divisors (35692381).

166665059 is a wasteful number, since it uses less digits than its factorization.

166665059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 166665059 is about 12909.8822225456. The cubic root of 166665059 is about 550.3194386773.

The spelling of 166665059 in words is "one hundred sixty-six million, six hundred sixty-five thousand, fifty-nine".