160166221 has 4 divisors (see below), whose sum is σ = 160625500. Its totient is φ = 159706944.

The previous prime is 160166191. The next prime is 160166239. The reversal of 160166221 is 122661061.

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 95942025 + 64224196 = 9795^2 + 8014^2 .

It is a cyclic number.

It is not a de Polignac number, because 160166221 - 2⁷ = 160166093 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 (160166291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229116 + ... + 229813.

It is an arithmetic number, because the mean of its divisors is an integer number (40156375).

Almost surely, 2^160166221 is an apocalyptic number.

It is an amenable number.

160166221 is a deficient number, since it is larger than the sum of its proper divisors (459279).

160166221 is an equidigital number, since it uses as much as digits as its factorization.

160166221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459278.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 160166221 is about 12655.6793970138. The cubic root of 160166221 is about 543.0714554254.

The spelling of 160166221 in words is "one hundred sixty million, one hundred sixty-six thousand, two hundred twenty-one".