7665123126709 has 2 divisors, whose sum is σ = 7665123126710. Its totient is φ = 7665123126708.

The previous prime is 7665123126671. The next prime is 7665123126719. The reversal of 7665123126709 is 9076213215667.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7618168570609 + 46954556100 = 2760103^2 + 216690^2 .

It is a cyclic number.

It is not a de Polignac number, because 7665123126709 - 2⁹ = 7665123126197 is a prime.

It is a super-2 number, since 2×7665123126709² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7665123126709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7665123126719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3832561563354 + 3832561563355.

It is an arithmetic number, because the mean of its divisors is an integer number (3832561563355).

Almost surely, 2^{7665123126709} is an apocalyptic number.

It is an amenable number.

7665123126709 is a deficient number, since it is larger than the sum of its proper divisors (1).

7665123126709 is an equidigital number, since it uses as much as digits as its factorization.

7665123126709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5715360, while the sum is 55.

The spelling of 7665123126709 in words is "seven trillion, six hundred sixty-five billion, one hundred twenty-three million, one hundred twenty-six thousand, seven hundred nine".