166631121 has 32 divisors (see below), whose sum is σ = 265420800. Its totient is φ = 102986640.

The previous prime is 166631117. The next prime is 166631123. The reversal of 166631121 is 121136661.

It is not a de Polignac number, because 166631121 - 2² = 166631117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (166631123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20656 + ... + 27566.

It is an arithmetic number, because the mean of its divisors is an integer number (8294400).

Almost surely, 2^166631121 is an apocalyptic number.

It is an amenable number.

166631121 is a deficient number, since it is larger than the sum of its proper divisors (98789679).

166631121 is a wasteful number, since it uses less digits than its factorization.

166631121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6986 (or 6980 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 166631121 is about 12908.5677361975. The cubic root of 166631121 is about 550.2820822990.

Adding to 166631121 its reverse (121136661), we get a palindrome (287767782).

The spelling of 166631121 in words is "one hundred sixty-six million, six hundred thirty-one thousand, one hundred twenty-one".