7655816128409 has 2 divisors, whose sum is σ = 7655816128410. Its totient is φ = 7655816128408.

The previous prime is 7655816128397. The next prime is 7655816128421. The reversal of 7655816128409 is 9048216185567.

It is a balanced prime because it is at equal distance from previous prime (7655816128397) and next prime (7655816128421).

It can be written as a sum of positive squares in only one way, i.e., 7465720128409 + 190096000000 = 2732347^2 + 436000^2 .

It is a cyclic number.

It is not a de Polignac number, because 7655816128409 - 2⁸ = 7655816128153 is a prime.

It is a super-2 number, since 2×7655816128409² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7655816128439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3827908064204 + 3827908064205.

It is an arithmetic number, because the mean of its divisors is an integer number (3827908064205).

Almost surely, 2^{7655816128409} is an apocalyptic number.

It is an amenable number.

7655816128409 is a deficient number, since it is larger than the sum of its proper divisors (1).

7655816128409 is an equidigital number, since it uses as much as digits as its factorization.

7655816128409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29030400, while the sum is 62.

The spelling of 7655816128409 in words is "seven trillion, six hundred fifty-five billion, eight hundred sixteen million, one hundred twenty-eight thousand, four hundred nine".