78807256573 has 2 divisors, whose sum is σ = 78807256574. Its totient is φ = 78807256572.

The previous prime is 78807256547. The next prime is 78807256589. The reversal of 78807256573 is 37565270887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70486533049 + 8320723524 = 265493^2 + 91218^2 .

It is an emirp because it is prime and its reverse (37565270887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78807256573 - 2²⁵ = 78773702141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78807256543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39403628286 + 39403628287.

It is an arithmetic number, because the mean of its divisors is an integer number (39403628287).

Almost surely, 2^78807256573 is an apocalyptic number.

It is an amenable number.

78807256573 is a deficient number, since it is larger than the sum of its proper divisors (1).

78807256573 is an equidigital number, since it uses as much as digits as its factorization.

78807256573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19756800, while the sum is 58.

The spelling of 78807256573 in words is "seventy-eight billion, eight hundred seven million, two hundred fifty-six thousand, five hundred seventy-three".