778617777871 has 2 divisors, whose sum is σ = 778617777872. Its totient is φ = 778617777870.

The previous prime is 778617777713. The next prime is 778617777907. The reversal of 778617777871 is 178777716877.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 778617777871 - 2²³ = 778609389263 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 778617777794 and 778617777803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778617774871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389308888935 + 389308888936.

It is an arithmetic number, because the mean of its divisors is an integer number (389308888936).

Almost surely, 2^778617777871 is an apocalyptic number.

778617777871 is a deficient number, since it is larger than the sum of its proper divisors (1).

778617777871 is an equidigital number, since it uses as much as digits as its factorization.

778617777871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 316240512, while the sum is 73.

The spelling of 778617777871 in words is "seven hundred seventy-eight billion, six hundred seventeen million, seven hundred seventy-seven thousand, eight hundred seventy-one".