66334309 has 2 divisors, whose sum is σ = 66334310. Its totient is φ = 66334308.

The previous prime is 66334283. The next prime is 66334313. The reversal of 66334309 is 90343366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61936900 + 4397409 = 7870^2 + 2097^2 .

It is a cyclic number.

It is not a de Polignac number, because 66334309 - 2¹¹ = 66332261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66334319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33167154 + 33167155.

It is an arithmetic number, because the mean of its divisors is an integer number (33167155).

Almost surely, 2^66334309 is an apocalyptic number.

It is an amenable number.

66334309 is a deficient number, since it is larger than the sum of its proper divisors (1).

66334309 is an equidigital number, since it uses as much as digits as its factorization.

66334309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 34.

The square root of 66334309 is about 8144.5877120945. The cubic root of 66334309 is about 404.8051880223.

The spelling of 66334309 in words is "sixty-six million, three hundred thirty-four thousand, three hundred nine".