166441138 has 4 divisors (see below), whose sum is σ = 249661710. Its totient is φ = 83220568.

The previous prime is 166441117. The next prime is 166441141. The reversal of 166441138 is 831144661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 113486409 + 52954729 = 10653^2 + 7277^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41610283 + ... + 41610286.

Almost surely, 2^166441138 is an apocalyptic number.

166441138 is a deficient number, since it is larger than the sum of its proper divisors (83220572).

166441138 is an equidigital number, since it uses as much as digits as its factorization.

166441138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83220571.

The product of its digits is 13824, while the sum is 34.

The square root of 166441138 is about 12901.2068427725. The cubic root of 166441138 is about 550.0728696839.

Adding to 166441138 its reverse (831144661), we get a palindrome (997585799).

The spelling of 166441138 in words is "one hundred sixty-six million, four hundred forty-one thousand, one hundred thirty-eight".