166742138 has 16 divisors (see below), whose sum is σ = 264153120. Its totient is φ = 78720336.

The previous prime is 166742131. The next prime is 166742153. The reversal of 166742138 is 831247661.

It is a super-2 number, since 2×166742138² = 55605881169622088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (166742131) 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 7 ways as a sum of consecutive naturals, for example, 4520 + ... + 18812.

It is an arithmetic number, because the mean of its divisors is an integer number (16509570).

Almost surely, 2^166742138 is an apocalyptic number.

166742138 is a deficient number, since it is larger than the sum of its proper divisors (97410982).

166742138 is a wasteful number, since it uses less digits than its factorization.

166742138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14621.

The product of its digits is 48384, while the sum is 38.

The square root of 166742138 is about 12912.8671487009. The cubic root of 166742138 is about 550.4042625646.

Adding to 166742138 its reverse (831247661), we get a palindrome (997989799).

The spelling of 166742138 in words is "one hundred sixty-six million, seven hundred forty-two thousand, one hundred thirty-eight".