78814308653 has 2 divisors, whose sum is σ = 78814308654. Its totient is φ = 78814308652.

The previous prime is 78814308637. The next prime is 78814308691. The reversal of 78814308653 is 35680341887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71189176969 + 7625131684 = 266813^2 + 87322^2 .

It is an emirp because it is prime and its reverse (35680341887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78814308653 - 2⁴ = 78814308637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78814308595 and 78814308604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78814301653) 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, 39407154326 + 39407154327.

It is an arithmetic number, because the mean of its divisors is an integer number (39407154327).

Almost surely, 2^78814308653 is an apocalyptic number.

It is an amenable number.

78814308653 is a deficient number, since it is larger than the sum of its proper divisors (1).

78814308653 is an equidigital number, since it uses as much as digits as its factorization.

78814308653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 78814308653 in words is "seventy-eight billion, eight hundred fourteen million, three hundred eight thousand, six hundred fifty-three".