71678388787987 has 2 divisors, whose sum is σ = 71678388787988. Its totient is φ = 71678388787986.

The previous prime is 71678388787727. The next prime is 71678388787991. The reversal of 71678388787987 is 78978788387617.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71678388787987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71678388787895 and 71678388787904.

It is not a weakly prime, because it can be changed into another prime (71678388787487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35839194393993 + 35839194393994.

It is an arithmetic number, because the mean of its divisors is an integer number (35839194393994).

Almost surely, 2^{71678388787987} is an apocalyptic number.

71678388787987 is a deficient number, since it is larger than the sum of its proper divisors (1).

71678388787987 is an equidigital number, since it uses as much as digits as its factorization.

71678388787987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 89218547712, while the sum is 94.

The spelling of 71678388787987 in words is "seventy-one trillion, six hundred seventy-eight billion, three hundred eighty-eight million, seven hundred eighty-seven thousand, nine hundred eighty-seven".