66634201 has 2 divisors, whose sum is σ = 66634202. Its totient is φ = 66634200.

The previous prime is 66634177. The next prime is 66634213. The reversal of 66634201 is 10243666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65593801 + 1040400 = 8099^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 66634201 - 2⁹ = 66633689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66634201.

It is not a weakly prime, because it can be changed into another prime (66634241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33317100 + 33317101.

It is an arithmetic number, because the mean of its divisors is an integer number (33317101).

Almost surely, 2^66634201 is an apocalyptic number.

It is an amenable number.

66634201 is a deficient number, since it is larger than the sum of its proper divisors (1).

66634201 is an equidigital number, since it uses as much as digits as its factorization.

66634201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66634201 is about 8162.9774592363. The cubic root of 66634201 is about 405.4143014365.

Adding to 66634201 its reverse (10243666), we get a palindrome (76877867).

The spelling of 66634201 in words is "sixty-six million, six hundred thirty-four thousand, two hundred one".