778425338513 has 2 divisors, whose sum is σ = 778425338514. Its totient is φ = 778425338512.

The previous prime is 778425338491. The next prime is 778425338557. The reversal of 778425338513 is 315833524877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 754278354064 + 24146984449 = 868492^2 + 155393^2 .

It is a cyclic number.

It is not a de Polignac number, because 778425338513 - 2¹⁸ = 778425076369 is a prime.

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 (778425338113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389212669256 + 389212669257.

It is an arithmetic number, because the mean of its divisors is an integer number (389212669257).

Almost surely, 2^778425338513 is an apocalyptic number.

It is an amenable number.

778425338513 is a deficient number, since it is larger than the sum of its proper divisors (1).

778425338513 is an equidigital number, since it uses as much as digits as its factorization.

778425338513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16934400, while the sum is 56.

The spelling of 778425338513 in words is "seven hundred seventy-eight billion, four hundred twenty-five million, three hundred thirty-eight thousand, five hundred thirteen".