166324021 has 8 divisors (see below), whose sum is σ = 172433664. Its totient is φ = 160260960.

The previous prime is 166324007. The next prime is 166324061. The reversal of 166324021 is 120423661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166324021 - 2⁷ = 166323893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166324061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4291 + ... + 18736.

It is an arithmetic number, because the mean of its divisors is an integer number (21554208).

Almost surely, 2^166324021 is an apocalyptic number.

It is an amenable number.

166324021 is a deficient number, since it is larger than the sum of its proper divisors (6109643).

166324021 is a wasteful number, since it uses less digits than its factorization.

166324021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23291.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 166324021 is about 12896.6670500560. The cubic root of 166324021 is about 549.9438190549.

Adding to 166324021 its reverse (120423661), we get a palindrome (286747682).

The spelling of 166324021 in words is "one hundred sixty-six million, three hundred twenty-four thousand, twenty-one".