78807373817 has 2 divisors, whose sum is σ = 78807373818. Its totient is φ = 78807373816.

The previous prime is 78807373787. The next prime is 78807373847. The reversal of 78807373817 is 71837370887.

It is a balanced prime because it is at equal distance from previous prime (78807373787) and next prime (78807373847).

It can be written as a sum of positive squares in only one way, i.e., 62508000256 + 16299373561 = 250016^2 + 127669^2 .

It is a cyclic number.

It is not a de Polignac number, because 78807373817 - 2¹⁰ = 78807372793 is a prime.

It is not a weakly prime, because it can be changed into another prime (78807373847) 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, 39403686908 + 39403686909.

It is an arithmetic number, because the mean of its divisors is an integer number (39403686909).

Almost surely, 2^78807373817 is an apocalyptic number.

It is an amenable number.

78807373817 is a deficient number, since it is larger than the sum of its proper divisors (1).

78807373817 is an equidigital number, since it uses as much as digits as its factorization.

78807373817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11063808, while the sum is 59.

The spelling of 78807373817 in words is "seventy-eight billion, eight hundred seven million, three hundred seventy-three thousand, eight hundred seventeen".