78078355073 has 2 divisors, whose sum is σ = 78078355074. Its totient is φ = 78078355072.

The previous prime is 78078355037. The next prime is 78078355087. The reversal of 78078355073 is 37055387087.

Together with previous prime (78078355037) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58569808144 + 19508546929 = 242012^2 + 139673^2 .

It is a cyclic number.

It is not a de Polignac number, because 78078355073 - 2²⁰ = 78077306497 is a prime.

It is not a weakly prime, because it can be changed into another prime (78078352073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39039177536 + 39039177537.

It is an arithmetic number, because the mean of its divisors is an integer number (39039177537).

Almost surely, 2^78078355073 is an apocalyptic number.

It is an amenable number.

78078355073 is a deficient number, since it is larger than the sum of its proper divisors (1).

78078355073 is an equidigital number, since it uses as much as digits as its factorization.

78078355073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4939200, while the sum is 53.

The spelling of 78078355073 in words is "seventy-eight billion, seventy-eight million, three hundred fifty-five thousand, seventy-three".