166555055 has 8 divisors (see below), whose sum is σ = 199962432. Its totient is φ = 133179808.

The previous prime is 166555043. The next prime is 166555057. The reversal of 166555055 is 550555661.

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 166555055 - 2²⁰ = 165506479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166555057) 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, 5429 + ... + 19041.

It is an arithmetic number, because the mean of its divisors is an integer number (24995304).

Almost surely, 2^166555055 is an apocalyptic number.

166555055 is a deficient number, since it is larger than the sum of its proper divisors (33407377).

166555055 is a wasteful number, since it uses less digits than its factorization.

166555055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16065.

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 166555055 is about 12905.6210621574. The cubic root of 166555055 is about 550.1983361826.

The spelling of 166555055 in words is "one hundred sixty-six million, five hundred fifty-five thousand, fifty-five".