78559065973 has 2 divisors, whose sum is σ = 78559065974. Its totient is φ = 78559065972.

The previous prime is 78559065971. The next prime is 78559066039. The reversal of 78559065973 is 37956095587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76570084369 + 1988981604 = 276713^2 + 44598^2 .

It is a cyclic number.

It is not a de Polignac number, because 78559065973 - 2¹ = 78559065971 is a prime.

Together with 78559065971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78559065971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39279532986 + 39279532987.

It is an arithmetic number, because the mean of its divisors is an integer number (39279532987).

Almost surely, 2^78559065973 is an apocalyptic number.

It is an amenable number.

78559065973 is a deficient number, since it is larger than the sum of its proper divisors (1).

78559065973 is an equidigital number, since it uses as much as digits as its factorization.

78559065973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442000, while the sum is 64.

The spelling of 78559065973 in words is "seventy-eight billion, five hundred fifty-nine million, sixty-five thousand, nine hundred seventy-three".