778425338557 has 2 divisors, whose sum is σ = 778425338558. Its totient is φ = 778425338556.

The previous prime is 778425338513. The next prime is 778425338599. The reversal of 778425338557 is 755833524877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 557731150596 + 220694187961 = 746814^2 + 469781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778425338557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778725338557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389212669278 + 389212669279.

It is an arithmetic number, because the mean of its divisors is an integer number (389212669279).

Almost surely, 2^778425338557 is an apocalyptic number.

It is an amenable number.

778425338557 is a deficient number, since it is larger than the sum of its proper divisors (1).

778425338557 is an equidigital number, since it uses as much as digits as its factorization.

778425338557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 197568000, while the sum is 64.

The spelling of 778425338557 in words is "seven hundred seventy-eight billion, four hundred twenty-five million, three hundred thirty-eight thousand, five hundred fifty-seven".