66084709 has 2 divisors, whose sum is σ = 66084710. Its totient is φ = 66084708.

The previous prime is 66084677. The next prime is 66084749. The reversal of 66084709 is 90748066.

It is an a-pointer prime, because the next prime (66084749) can be obtained adding 66084709 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37761025 + 28323684 = 6145^2 + 5322^2 .

It is a cyclic number.

It is not a de Polignac number, because 66084709 - 2⁵ = 66084677 is a prime.

It is a super-2 number, since 2×66084709² = 8734377527229362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66084749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33042354 + 33042355.

It is an arithmetic number, because the mean of its divisors is an integer number (33042355).

Almost surely, 2^66084709 is an apocalyptic number.

It is an amenable number.

66084709 is a deficient number, since it is larger than the sum of its proper divisors (1).

66084709 is an equidigital number, since it uses as much as digits as its factorization.

66084709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66084709 is about 8129.2502114279. The cubic root of 66084709 is about 404.2968217838.

The spelling of 66084709 in words is "sixty-six million, eighty-four thousand, seven hundred nine".