66271201 has 2 divisors, whose sum is σ = 66271202. Its totient is φ = 66271200.

The previous prime is 66271189. The next prime is 66271217. The reversal of 66271201 is 10217266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57744801 + 8526400 = 7599^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 66271201 - 2¹¹ = 66269153 is a prime.

It is not a weakly prime, because it can be changed into another prime (66271501) 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, 33135600 + 33135601.

It is an arithmetic number, because the mean of its divisors is an integer number (33135601).

Almost surely, 2^66271201 is an apocalyptic number.

It is an amenable number.

66271201 is a deficient number, since it is larger than the sum of its proper divisors (1).

66271201 is an equidigital number, since it uses as much as digits as its factorization.

66271201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 66271201 is about 8140.7125609494. The cubic root of 66271201 is about 404.6767750799.

Adding to 66271201 its reverse (10217266), we get a palindrome (76488467).

The spelling of 66271201 in words is "sixty-six million, two hundred seventy-one thousand, two hundred one".