78394570913 has 2 divisors, whose sum is σ = 78394570914. Its totient is φ = 78394570912.

The previous prime is 78394570873. The next prime is 78394570973. The reversal of 78394570913 is 31907549387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67804514449 + 10590056464 = 260393^2 + 102908^2 .

It is a cyclic number.

It is not a de Polignac number, because 78394570913 - 2³⁴ = 61214701729 is a prime.

It is a super-3 number, since 3×78394570913³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78394570973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39197285456 + 39197285457.

It is an arithmetic number, because the mean of its divisors is an integer number (39197285457).

Almost surely, 2^78394570913 is an apocalyptic number.

It is an amenable number.

78394570913 is a deficient number, since it is larger than the sum of its proper divisors (1).

78394570913 is an equidigital number, since it uses as much as digits as its factorization.

78394570913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5715360, while the sum is 56.

The spelling of 78394570913 in words is "seventy-eight billion, three hundred ninety-four million, five hundred seventy thousand, nine hundred thirteen".