65666331709 has 16 divisors (see below), whose sum is σ = 72516487680. Its totient is φ = 58963270960.

The previous prime is 65666331691. The next prime is 65666331713. The reversal of 65666331709 is 90713366656.

It is not a de Polignac number, because 65666331709 - 2¹¹ = 65666329661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65666331739) 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 in 15 ways as a sum of consecutive naturals, for example, 6403224 + ... + 6413470.

It is an arithmetic number, because the mean of its divisors is an integer number (4532280480).

Almost surely, 2^65666331709 is an apocalyptic number.

It is an amenable number.

65666331709 is a deficient number, since it is larger than the sum of its proper divisors (6850155971).

65666331709 is a wasteful number, since it uses less digits than its factorization.

65666331709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17360.

The product of its (nonzero) digits is 3674160, while the sum is 52.

The spelling of 65666331709 in words is "sixty-five billion, six hundred sixty-six million, three hundred thirty-one thousand, seven hundred nine".