166142146 has 4 divisors (see below), whose sum is σ = 249213222. Its totient is φ = 83071072.

The previous prime is 166142143. The next prime is 166142149. The reversal of 166142146 is 641241661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 641241661 = 6163 ⋅104047.

It is an interprime number because it is at equal distance from previous prime (166142143) and next prime (166142149).

It can be written as a sum of positive squares in only one way, i.e., 164480625 + 1661521 = 12825^2 + 1289^2 .

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 not an unprimeable number, because it can be changed into a prime (166142143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41535535 + ... + 41535538.

Almost surely, 2^166142146 is an apocalyptic number.

166142146 is a deficient number, since it is larger than the sum of its proper divisors (83071076).

166142146 is an equidigital number, since it uses as much as digits as its factorization.

166142146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83071075.

The product of its digits is 6912, while the sum is 31.

The square root of 166142146 is about 12889.6138809508. The cubic root of 166142146 is about 549.7432917723.

The spelling of 166142146 in words is "one hundred sixty-six million, one hundred forty-two thousand, one hundred forty-six".