66166201 has 2 divisors, whose sum is σ = 66166202. Its totient is φ = 66166200.

The previous prime is 66166171. The next prime is 66166223. The reversal of 66166201 is 10266166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56250000 + 9916201 = 7500^2 + 3149^2 .

It is a cyclic number.

It is not a de Polignac number, because 66166201 - 2⁷ = 66166073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66166201.

It is not a weakly prime, because it can be changed into another prime (66166231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33083100 + 33083101.

It is an arithmetic number, because the mean of its divisors is an integer number (33083101).

Almost surely, 2^66166201 is an apocalyptic number.

It is an amenable number.

66166201 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166201 is an equidigital number, since it uses as much as digits as its factorization.

66166201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 66166201 is about 8134.2609375407. The cubic root of 66166201 is about 404.4629389970.

The spelling of 66166201 in words is "sixty-six million, one hundred sixty-six thousand, two hundred one".