77345336609 has 2 divisors, whose sum is σ = 77345336610. Its totient is φ = 77345336608.

The previous prime is 77345336599. The next prime is 77345336623. The reversal of 77345336609 is 90663354377.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70398947584 + 6946389025 = 265328^2 + 83345^2 .

It is an emirp because it is prime and its reverse (90663354377) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77345336609 - 2²⁴ = 77328559393 is a prime.

It is not a weakly prime, because it can be changed into another prime (77345336639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38672668304 + 38672668305.

It is an arithmetic number, because the mean of its divisors is an integer number (38672668305).

Almost surely, 2^77345336609 is an apocalyptic number.

It is an amenable number.

77345336609 is a deficient number, since it is larger than the sum of its proper divisors (1).

77345336609 is an equidigital number, since it uses as much as digits as its factorization.

77345336609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8573040, while the sum is 53.

The spelling of 77345336609 in words is "seventy-seven billion, three hundred forty-five million, three hundred thirty-six thousand, six hundred nine".