166276321 has 2 divisors, whose sum is σ = 166276322. Its totient is φ = 166276320.

The previous prime is 166276289. The next prime is 166276351. The reversal of 166276321 is 123672661.

It is a happy number.

166276321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104040000 + 62236321 = 10200^2 + 7889^2 .

It is a cyclic number.

It is not a de Polignac number, because 166276321 - 2⁵ = 166276289 is a prime.

It is not a weakly prime, because it can be changed into another prime (166276351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83138160 + 83138161.

It is an arithmetic number, because the mean of its divisors is an integer number (83138161).

Almost surely, 2^166276321 is an apocalyptic number.

It is an amenable number.

166276321 is a deficient number, since it is larger than the sum of its proper divisors (1).

166276321 is an equidigital number, since it uses as much as digits as its factorization.

166276321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 166276321 is about 12894.8176024324. The cubic root of 166276321 is about 549.8912413051.

The spelling of 166276321 in words is "one hundred sixty-six million, two hundred seventy-six thousand, three hundred twenty-one".