66210253 has 2 divisors, whose sum is σ = 66210254. Its totient is φ = 66210252.

The previous prime is 66210251. The next prime is 66210259. The reversal of 66210253 is 35201266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64352484 + 1857769 = 8022^2 + 1363^2 .

It is a cyclic number.

It is not a de Polignac number, because 66210253 - 2¹ = 66210251 is a prime.

Together with 66210251, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66210251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33105126 + 33105127.

It is an arithmetic number, because the mean of its divisors is an integer number (33105127).

Almost surely, 2^66210253 is an apocalyptic number.

It is an amenable number.

66210253 is a deficient number, since it is larger than the sum of its proper divisors (1).

66210253 is an equidigital number, since it uses as much as digits as its factorization.

66210253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 66210253 is about 8136.9682929209. The cubic root of 66210253 is about 404.5526799244.

The spelling of 66210253 in words is "sixty-six million, two hundred ten thousand, two hundred fifty-three".