77778632317 has 2 divisors, whose sum is σ = 77778632318. Its totient is φ = 77778632316.

The previous prime is 77778632263. The next prime is 77778632383. The reversal of 77778632317 is 71323687777.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77703792516 + 74839801 = 278754^2 + 8651^2 .

It is a cyclic number.

It is not a de Polignac number, because 77778632317 - 2⁷ = 77778632189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77778632417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38889316158 + 38889316159.

It is an arithmetic number, because the mean of its divisors is an integer number (38889316159).

Almost surely, 2^77778632317 is an apocalyptic number.

It is an amenable number.

77778632317 is a deficient number, since it is larger than the sum of its proper divisors (1).

77778632317 is an equidigital number, since it uses as much as digits as its factorization.

77778632317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14521248, while the sum is 58.

The spelling of 77778632317 in words is "seventy-seven billion, seven hundred seventy-eight million, six hundred thirty-two thousand, three hundred seventeen".