6978434371663 has 2 divisors, whose sum is σ = 6978434371664. Its totient is φ = 6978434371662.

The previous prime is 6978434371661. The next prime is 6978434371709. The reversal of 6978434371663 is 3661734348796.

6978434371663 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6978434371663 - 2¹ = 6978434371661 is a prime.

Together with 6978434371661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6978434371661) 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, 3489217185831 + 3489217185832.

It is an arithmetic number, because the mean of its divisors is an integer number (3489217185832).

Almost surely, 2^{6978434371663} is an apocalyptic number.

6978434371663 is a deficient number, since it is larger than the sum of its proper divisors (1).

6978434371663 is an equidigital number, since it uses as much as digits as its factorization.

6978434371663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 329204736, while the sum is 67.

The spelling of 6978434371663 in words is "six trillion, nine hundred seventy-eight billion, four hundred thirty-four million, three hundred seventy-one thousand, six hundred sixty-three".