166128106 has 4 divisors (see below), whose sum is σ = 249192162. Its totient is φ = 83064052.

The previous prime is 166128091. The next prime is 166128119. The reversal of 166128106 is 601821661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 601821661 = 7 ⋅85974523.

It can be written as a sum of positive squares in only one way, i.e., 154629225 + 11498881 = 12435^2 + 3391^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 41532025 + ... + 41532028.

Almost surely, 2^166128106 is an apocalyptic number.

166128106 is a deficient number, since it is larger than the sum of its proper divisors (83064056).

166128106 is an equidigital number, since it uses as much as digits as its factorization.

166128106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83064055.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 166128106 is about 12889.0692449067. The cubic root of 166128106 is about 549.7278058096.

Adding to 166128106 its reverse (601821661), we get a palindrome (767949767).

The spelling of 166128106 in words is "one hundred sixty-six million, one hundred twenty-eight thousand, one hundred six".