7788718081 has 2 divisors, whose sum is σ = 7788718082. Its totient is φ = 7788718080.

The previous prime is 7788718073. The next prime is 7788718159. The reversal of 7788718081 is 1808178877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7130282481 + 658435600 = 84441^2 + 25660^2 .

It is a cyclic number.

It is not a de Polignac number, because 7788718081 - 2³ = 7788718073 is a prime.

It is a super-2 number, since 2×7788718081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7788716081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3894359040 + 3894359041.

It is an arithmetic number, because the mean of its divisors is an integer number (3894359041).

Almost surely, 2^7788718081 is an apocalyptic number.

It is an amenable number.

7788718081 is a deficient number, since it is larger than the sum of its proper divisors (1).

7788718081 is an equidigital number, since it uses as much as digits as its factorization.

7788718081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1404928, while the sum is 55.

The square root of 7788718081 is about 88253.7142617805. The cubic root of 7788718081 is about 1982.2358581943.

The spelling of 7788718081 in words is "seven billion, seven hundred eighty-eight million, seven hundred eighteen thousand, eighty-one".