166146321 has 32 divisors (see below), whose sum is σ = 259452288. Its totient is φ = 93450240.

The previous prime is 166146311. The next prime is 166146359. The reversal of 166146321 is 123641661.

It is not a de Polignac number, because 166146321 - 2⁵ = 166146289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166146311) 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 31 ways as a sum of consecutive naturals, for example, 38925 + ... + 42981.

It is an arithmetic number, because the mean of its divisors is an integer number (8107884).

Almost surely, 2^166146321 is an apocalyptic number.

166146321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166146321 is a deficient number, since it is larger than the sum of its proper divisors (93305967).

166146321 is a wasteful number, since it uses less digits than its factorization.

166146321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4161.

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

The square root of 166146321 is about 12889.7758320306. The cubic root of 166146321 is about 549.7478965823.

Adding to 166146321 its reverse (123641661), we get a palindrome (289787982).

The spelling of 166146321 in words is "one hundred sixty-six million, one hundred forty-six thousand, three hundred twenty-one".