166641123 has 32 divisors (see below), whose sum is σ = 258612480. Its totient is φ = 94325760.

The previous prime is 166641103. The next prime is 166641131. The reversal of 166641123 is 321146661.

It is not a de Polignac number, because 166641123 - 2⁵ = 166641091 is a prime.

It is a super-2 number, since 2×166641123² = 55538527749402258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166641103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76911 + ... + 79047.

It is an arithmetic number, because the mean of its divisors is an integer number (8081640).

Almost surely, 2^166641123 is an apocalyptic number.

166641123 is a deficient number, since it is larger than the sum of its proper divisors (91971357).

166641123 is a wasteful number, since it uses less digits than its factorization.

166641123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307.

The product of its digits is 5184, while the sum is 30.

The square root of 166641123 is about 12908.9551474935. The cubic root of 166641123 is about 550.2930922697.

Adding to 166641123 its reverse (321146661), we get a palindrome (487787784).

The spelling of 166641123 in words is "one hundred sixty-six million, six hundred forty-one thousand, one hundred twenty-three".