160666321 has 4 divisors (see below), whose sum is σ = 165008692. Its totient is φ = 156323952.

The previous prime is 160666309. The next prime is 160666369. The reversal of 160666321 is 123666061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71571600 + 89094721 = 8460^2 + 9439^2 .

It is a cyclic number.

It is not a de Polignac number, because 160666321 - 2⁷ = 160666193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (160667321) 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 3 ways as a sum of consecutive naturals, for example, 2171130 + ... + 2171203.

It is an arithmetic number, because the mean of its divisors is an integer number (41252173).

Almost surely, 2^160666321 is an apocalyptic number.

It is an amenable number.

160666321 is a deficient number, since it is larger than the sum of its proper divisors (4342371).

160666321 is an equidigital number, since it uses as much as digits as its factorization.

160666321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4342370.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 160666321 is about 12675.4219259163. The cubic root of 160666321 is about 543.6360935313.

The spelling of 160666321 in words is "one hundred sixty million, six hundred sixty-six thousand, three hundred twenty-one".