7665712909 has 2 divisors, whose sum is σ = 7665712910. Its totient is φ = 7665712908.

The previous prime is 7665712907. The next prime is 7665712931. The reversal of 7665712909 is 9092175667.

It is a happy number.

7665712909 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4938575625 + 2727137284 = 70275^2 + 52222^2 .

It is an emirp because it is prime and its reverse (9092175667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7665712909 - 2¹ = 7665712907 is a prime.

Together with 7665712907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7665712907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3832856454 + 3832856455.

It is an arithmetic number, because the mean of its divisors is an integer number (3832856455).

Almost surely, 2^7665712909 is an apocalyptic number.

It is an amenable number.

7665712909 is a deficient number, since it is larger than the sum of its proper divisors (1).

7665712909 is an equidigital number, since it uses as much as digits as its factorization.

7665712909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 52.

The square root of 7665712909 is about 87554.0570676197. The cubic root of 7665712909 is about 1971.7454626539.

The spelling of 7665712909 in words is "seven billion, six hundred sixty-five million, seven hundred twelve thousand, nine hundred nine".