6978808643 has 2 divisors, whose sum is σ = 6978808644. Its totient is φ = 6978808642.

The previous prime is 6978808607. The next prime is 6978808667. The reversal of 6978808643 is 3468088796.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6978808643 - 2⁶ = 6978808579 is a prime.

It is a super-2 number, since 2×6978808643² = 97407540151223002898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6978804643) 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, 3489404321 + 3489404322.

It is an arithmetic number, because the mean of its divisors is an integer number (3489404322).

Almost surely, 2^6978808643 is an apocalyptic number.

6978808643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6978808643 is an equidigital number, since it uses as much as digits as its factorization.

6978808643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13934592, while the sum is 59.

The square root of 6978808643 is about 83539.2640798325. The cubic root of 6978808643 is about 1910.9988692702.

The spelling of 6978808643 in words is "six billion, nine hundred seventy-eight million, eight hundred eight thousand, six hundred forty-three".