664511201 has 2 divisors, whose sum is σ = 664511202. Its totient is φ = 664511200.

The previous prime is 664511167. The next prime is 664511261. The reversal of 664511201 is 102115466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645160000 + 19351201 = 25400^2 + 4399^2 .

It is a cyclic number.

It is not a de Polignac number, because 664511201 - 2⁶ = 664511137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (664511261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332255600 + 332255601.

It is an arithmetic number, because the mean of its divisors is an integer number (332255601).

Almost surely, 2^664511201 is an apocalyptic number.

It is an amenable number.

664511201 is a deficient number, since it is larger than the sum of its proper divisors (1).

664511201 is an equidigital number, since it uses as much as digits as its factorization.

664511201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 664511201 is about 25778.1147681517. The cubic root of 664511201 is about 872.6379618896.

Adding to 664511201 its reverse (102115466), we get a palindrome (766626667).

The spelling of 664511201 in words is "six hundred sixty-four million, five hundred eleven thousand, two hundred one".