166661055 has 24 divisors (see below), whose sum is σ = 315141840. Its totient is φ = 80805120.

The previous prime is 166661039. The next prime is 166661123. The reversal of 166661055 is 550166661.

It is not a de Polignac number, because 166661055 - 2⁴ = 166661039 is a prime.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 167850 + ... + 168839.

It is an arithmetic number, because the mean of its divisors is an integer number (13130910).

Almost surely, 2^166661055 is an apocalyptic number.

166661055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166661055 is a deficient number, since it is larger than the sum of its proper divisors (148480785).

166661055 is a wasteful number, since it uses less digits than its factorization.

166661055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336711 (or 336708 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 166661055 is about 12909.7271466131. The cubic root of 166661055 is about 550.3150316414.

The spelling of 166661055 in words is "one hundred sixty-six million, six hundred sixty-one thousand, fifty-five".