166204055 has 4 divisors (see below), whose sum is σ = 199444872. Its totient is φ = 132963240.

The previous prime is 166204043. The next prime is 166204081. The reversal of 166204055 is 550402661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550402661 = 1999 ⋅275339.

It is not a de Polignac number, because 166204055 - 2⁸ = 166203799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16620401 + ... + 16620410.

It is an arithmetic number, because the mean of its divisors is an integer number (49861218).

Almost surely, 2^166204055 is an apocalyptic number.

166204055 is a deficient number, since it is larger than the sum of its proper divisors (33240817).

166204055 is an equidigital number, since it uses as much as digits as its factorization.

166204055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33240816.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 166204055 is about 12892.0151644341. The cubic root of 166204055 is about 549.8115663027.

The spelling of 166204055 in words is "one hundred sixty-six million, two hundred four thousand, fifty-five".