77745600654809 has 2 divisors, whose sum is σ = 77745600654810. Its totient is φ = 77745600654808.

The previous prime is 77745600654769. The next prime is 77745600654851. The reversal of 77745600654809 is 90845600654777.

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., 74355214964809 + 3390385690000 = 8622947^2 + 1841300^2 .

It is a cyclic number.

It is not a de Polignac number, because 77745600654809 - 2²⁸ = 77745332219353 is a prime.

It is not a weakly prime, because it can be changed into another prime (77745600654899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38872800327404 + 38872800327405.

It is an arithmetic number, because the mean of its divisors is an integer number (38872800327405).

Almost surely, 2^{77745600654809} is an apocalyptic number.

It is an amenable number.

77745600654809 is a deficient number, since it is larger than the sum of its proper divisors (1).

77745600654809 is an equidigital number, since it uses as much as digits as its factorization.

77745600654809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 355622400, while the sum is 68.

The spelling of 77745600654809 in words is "seventy-seven trillion, seven hundred forty-five billion, six hundred million, six hundred fifty-four thousand, eight hundred nine".