78734666317 has 2 divisors, whose sum is σ = 78734666318. Its totient is φ = 78734666316.

The previous prime is 78734666299. The next prime is 78734666399. The reversal of 78734666317 is 71366643787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62057784996 + 16676881321 = 249114^2 + 129139^2 .

It is a cyclic number.

It is not a de Polignac number, because 78734666317 - 2¹¹ = 78734664269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78734660317) 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, 39367333158 + 39367333159.

It is an arithmetic number, because the mean of its divisors is an integer number (39367333159).

Almost surely, 2^78734666317 is an apocalyptic number.

It is an amenable number.

78734666317 is a deficient number, since it is larger than the sum of its proper divisors (1).

78734666317 is an equidigital number, since it uses as much as digits as its factorization.

78734666317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21337344, while the sum is 58.

The spelling of 78734666317 in words is "seventy-eight billion, seven hundred thirty-four million, six hundred sixty-six thousand, three hundred seventeen".