78688138073771 has 2 divisors, whose sum is σ = 78688138073772. Its totient is φ = 78688138073770.

The previous prime is 78688138073663. The next prime is 78688138073801. The reversal of 78688138073771 is 17737083188687.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78688138073771 - 2¹⁸ = 78688137811627 is a prime.

It is not a weakly prime, because it can be changed into another prime (78688138073971) 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, 39344069036885 + 39344069036886.

It is an arithmetic number, because the mean of its divisors is an integer number (39344069036886).

Almost surely, 2^{78688138073771} is an apocalyptic number.

78688138073771 is a deficient number, since it is larger than the sum of its proper divisors (1).

78688138073771 is an equidigital number, since it uses as much as digits as its factorization.

78688138073771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 531062784, while the sum is 74.

The spelling of 78688138073771 in words is "seventy-eight trillion, six hundred eighty-eight billion, one hundred thirty-eight million, seventy-three thousand, seven hundred seventy-one".