166360321 has 2 divisors, whose sum is σ = 166360322. Its totient is φ = 166360320.

The previous prime is 166360319. The next prime is 166360349. The reversal of 166360321 is 123063661.

It is an a-pointer prime, because the next prime (166360349) can be obtained adding 166360321 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138650625 + 27709696 = 11775^2 + 5264^2 .

It is a cyclic number.

It is not a de Polignac number, because 166360321 - 2¹ = 166360319 is a prime.

Together with 166360319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 166360321.

It is not a weakly prime, because it can be changed into another prime (166360301) 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 as a sum of consecutive naturals, namely, 83180160 + 83180161.

It is an arithmetic number, because the mean of its divisors is an integer number (83180161).

Almost surely, 2^166360321 is an apocalyptic number.

It is an amenable number.

166360321 is a deficient number, since it is larger than the sum of its proper divisors (1).

166360321 is an equidigital number, since it uses as much as digits as its factorization.

166360321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 166360321 is about 12898.0743136330. The cubic root of 166360321 is about 549.9838243177.

The spelling of 166360321 in words is "one hundred sixty-six million, three hundred sixty thousand, three hundred twenty-one".