77988981441089 has 2 divisors, whose sum is σ = 77988981441090. Its totient is φ = 77988981441088.

The previous prime is 77988981441011. The next prime is 77988981441139. The reversal of 77988981441089 is 98014418988977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55127358048400 + 22861623392689 = 7424780^2 + 4781383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77988981441089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77988981440998 and 77988981441016.

It is not a weakly prime, because it can be changed into another prime (77988981441689) 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, 38994490720544 + 38994490720545.

It is an arithmetic number, because the mean of its divisors is an integer number (38994490720545).

Almost surely, 2^{77988981441089} is an apocalyptic number.

It is an amenable number.

77988981441089 is a deficient number, since it is larger than the sum of its proper divisors (1).

77988981441089 is an equidigital number, since it uses as much as digits as its factorization.

77988981441089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2341011456, while the sum is 83.

The spelling of 77988981441089 in words is "seventy-seven trillion, nine hundred eighty-eight billion, nine hundred eighty-one million, four hundred forty-one thousand, eighty-nine".