181228166 has 32 divisors (see below), whose sum is σ = 321830400. Its totient is φ = 76490568.

The previous prime is 181228141. The next prime is 181228169. The reversal of 181228166 is 661822181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181228169) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 43991 + ... + 47933.

It is an arithmetic number, because the mean of its divisors is an integer number (10057200).

Almost surely, 2^181228166 is an apocalyptic number.

181228166 is a deficient number, since it is larger than the sum of its proper divisors (140602234).

181228166 is an equidigital number, since it uses as much as digits as its factorization.

181228166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033 (or 4019 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 181228166 is about 13462.1010990113. The cubic root of 181228166 is about 565.9028726193.

The spelling of 181228166 in words is "one hundred eighty-one million, two hundred twenty-eight thousand, one hundred sixty-six".