778147640077 has 2 divisors, whose sum is σ = 778147640078. Its totient is φ = 778147640076.

The previous prime is 778147640021. The next prime is 778147640111. The reversal of 778147640077 is 770046741877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 713372808996 + 64774831081 = 844614^2 + 254509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778147640077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778147640177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389073820038 + 389073820039.

It is an arithmetic number, because the mean of its divisors is an integer number (389073820039).

Almost surely, 2^778147640077 is an apocalyptic number.

It is an amenable number.

778147640077 is a deficient number, since it is larger than the sum of its proper divisors (1).

778147640077 is an equidigital number, since it uses as much as digits as its factorization.

778147640077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12907776, while the sum is 58.

The spelling of 778147640077 in words is "seven hundred seventy-eight billion, one hundred forty-seven million, six hundred forty thousand, seventy-seven".