778196785901 has 2 divisors, whose sum is σ = 778196785902. Its totient is φ = 778196785900.

The previous prime is 778196785889. The next prime is 778196785981. The reversal of 778196785901 is 109587691877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549807420100 + 228389365801 = 741490^2 + 477901^2 .

It is a cyclic number.

It is not a de Polignac number, because 778196785901 - 2⁶ = 778196785837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778196785981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389098392950 + 389098392951.

It is an arithmetic number, because the mean of its divisors is an integer number (389098392951).

Almost surely, 2^778196785901 is an apocalyptic number.

It is an amenable number.

778196785901 is a deficient number, since it is larger than the sum of its proper divisors (1).

778196785901 is an equidigital number, since it uses as much as digits as its factorization.

778196785901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53343360, while the sum is 68.

The spelling of 778196785901 in words is "seven hundred seventy-eight billion, one hundred ninety-six million, seven hundred eighty-five thousand, nine hundred one".