166456321 has 8 divisors (see below), whose sum is σ = 175794080. Its totient is φ = 157176288.

The previous prime is 166456319. The next prime is 166456331. The reversal of 166456321 is 123654661.

166456321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 166456321 - 2¹ = 166456319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166456331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8436 + ... + 20101.

It is an arithmetic number, because the mean of its divisors is an integer number (21974260).

Almost surely, 2^166456321 is an apocalyptic number.

It is an amenable number.

166456321 is a deficient number, since it is larger than the sum of its proper divisors (9337759).

166456321 is a wasteful number, since it uses less digits than its factorization.

166456321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28863.

The product of its digits is 25920, while the sum is 34.

The square root of 166456321 is about 12901.7952626757. The cubic root of 166456321 is about 550.0895953214.

The spelling of 166456321 in words is "one hundred sixty-six million, four hundred fifty-six thousand, three hundred twenty-one".