78523067789 has 2 divisors, whose sum is σ = 78523067790. Its totient is φ = 78523067788.

The previous prime is 78523067737. The next prime is 78523067863. The reversal of 78523067789 is 98776032587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39743612164 + 38779455625 = 199358^2 + 196925^2 .

It is an emirp because it is prime and its reverse (98776032587) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78523067789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78523067089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39261533894 + 39261533895.

It is an arithmetic number, because the mean of its divisors is an integer number (39261533895).

Almost surely, 2^78523067789 is an apocalyptic number.

It is an amenable number.

78523067789 is a deficient number, since it is larger than the sum of its proper divisors (1).

78523067789 is an equidigital number, since it uses as much as digits as its factorization.

78523067789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35562240, while the sum is 62.

The spelling of 78523067789 in words is "seventy-eight billion, five hundred twenty-three million, sixty-seven thousand, seven hundred eighty-nine".