860166221 has 16 divisors (see below), whose sum is σ = 930651120. Its totient is φ = 792084480.

The previous prime is 860166217. The next prime is 860166257. The reversal of 860166221 is 122661068.

It can be written as a sum of positive squares in 8 ways, for example, as 3960100 + 856206121 = 1990^2 + 29261^2 .

It is a cyclic number.

It is not a de Polignac number, because 860166221 - 2² = 860166217 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 (860166821) 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 15 ways as a sum of consecutive naturals, for example, 143831 + ... + 149691.

It is an arithmetic number, because the mean of its divisors is an integer number (58165695).

Almost surely, 2^860166221 is an apocalyptic number.

It is an amenable number.

860166221 is a deficient number, since it is larger than the sum of its proper divisors (70484899).

860166221 is a wasteful number, since it uses less digits than its factorization.

860166221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6064.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 860166221 is about 29328.5905048299. The cubic root of 860166221 is about 951.0298051659.

The spelling of 860166221 in words is "eight hundred sixty million, one hundred sixty-six thousand, two hundred twenty-one".