66284209 has 2 divisors, whose sum is σ = 66284210. Its totient is φ = 66284208.

The previous prime is 66284203. The next prime is 66284233. The reversal of 66284209 is 90248266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52056225 + 14227984 = 7215^2 + 3772^2 .

It is a cyclic number.

It is not a de Polignac number, because 66284209 - 2³ = 66284201 is a prime.

It is not a weakly prime, because it can be changed into another prime (66284201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33142104 + 33142105.

It is an arithmetic number, because the mean of its divisors is an integer number (33142105).

Almost surely, 2^66284209 is an apocalyptic number.

It is an amenable number.

66284209 is a deficient number, since it is larger than the sum of its proper divisors (1).

66284209 is an equidigital number, since it uses as much as digits as its factorization.

66284209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 66284209 is about 8141.5114690087. The cubic root of 66284209 is about 404.7032505878.

The spelling of 66284209 in words is "sixty-six million, two hundred eighty-four thousand, two hundred nine".