66714209 has 2 divisors, whose sum is σ = 66714210. Its totient is φ = 66714208.

The previous prime is 66714173. The next prime is 66714217. The reversal of 66714209 is 90241766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64754209 + 1960000 = 8047^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 66714209 - 2²⁴ = 49936993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66714229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33357104 + 33357105.

It is an arithmetic number, because the mean of its divisors is an integer number (33357105).

Almost surely, 2^66714209 is an apocalyptic number.

It is an amenable number.

66714209 is a deficient number, since it is larger than the sum of its proper divisors (1).

66714209 is an equidigital number, since it uses as much as digits as its factorization.

66714209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 66714209 is about 8167.8766518600. The cubic root of 66714209 is about 405.5764974931.

The spelling of 66714209 in words is "sixty-six million, seven hundred fourteen thousand, two hundred nine".