66635201 has 2 divisors, whose sum is σ = 66635202. Its totient is φ = 66635200.

The previous prime is 66635183. The next prime is 66635227. The reversal of 66635201 is 10253666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66178225 + 456976 = 8135^2 + 676^2 .

It is a cyclic number.

It is not a de Polignac number, because 66635201 - 2¹⁰ = 66634177 is a prime.

It is not a weakly prime, because it can be changed into another prime (66635281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33317600 + 33317601.

It is an arithmetic number, because the mean of its divisors is an integer number (33317601).

Almost surely, 2^66635201 is an apocalyptic number.

It is an amenable number.

66635201 is a deficient number, since it is larger than the sum of its proper divisors (1).

66635201 is an equidigital number, since it uses as much as digits as its factorization.

66635201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66635201 is about 8163.0387111663. The cubic root of 66635201 is about 405.4163294855.

Adding to 66635201 its reverse (10253666), we get a palindrome (76888867).

The spelling of 66635201 in words is "sixty-six million, six hundred thirty-five thousand, two hundred one".