166643201 has 2 divisors, whose sum is σ = 166643202. Its totient is φ = 166643200.

The previous prime is 166643179. The next prime is 166643219. The reversal of 166643201 is 102346661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95257600 + 71385601 = 9760^2 + 8449^2 .

It is an emirp because it is prime and its reverse (102346661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166643201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166643221) 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, 83321600 + 83321601.

It is an arithmetic number, because the mean of its divisors is an integer number (83321601).

Almost surely, 2^166643201 is an apocalyptic number.

It is an amenable number.

166643201 is a deficient number, since it is larger than the sum of its proper divisors (1).

166643201 is an equidigital number, since it uses as much as digits as its factorization.

166643201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 166643201 is about 12909.0356340046. The cubic root of 166643201 is about 550.2953796288.

Adding to 166643201 its reverse (102346661), we get a palindrome (268989862).

The spelling of 166643201 in words is "one hundred sixty-six million, six hundred forty-three thousand, two hundred one".