66440201 has 2 divisors, whose sum is σ = 66440202. Its totient is φ = 66440200.

The previous prime is 66440173. The next prime is 66440237. The reversal of 66440201 is 10204466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65593801 + 846400 = 8099^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 66440201 - 2⁶ = 66440137 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66440251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33220100 + 33220101.

It is an arithmetic number, because the mean of its divisors is an integer number (33220101).

Almost surely, 2^66440201 is an apocalyptic number.

It is an amenable number.

66440201 is a deficient number, since it is larger than the sum of its proper divisors (1).

66440201 is an equidigital number, since it uses as much as digits as its factorization.

66440201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 66440201 is about 8151.0858785808. The cubic root of 66440201 is about 405.0204755182.

Adding to 66440201 its reverse (10204466), we get a palindrome (76644667).

The spelling of 66440201 in words is "sixty-six million, four hundred forty thousand, two hundred one".