6989867867 has 2 divisors, whose sum is σ = 6989867868. Its totient is φ = 6989867866.

The previous prime is 6989867791. The next prime is 6989867869. The reversal of 6989867867 is 7687689896.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6989867867 - 2¹⁰ = 6989866843 is a prime.

Together with 6989867869, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6989867794 and 6989867803.

It is not a weakly prime, because it can be changed into another prime (6989867869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494933933 + 3494933934.

It is an arithmetic number, because the mean of its divisors is an integer number (3494933934).

Almost surely, 2^6989867867 is an apocalyptic number.

6989867867 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989867867 is an equidigital number, since it uses as much as digits as its factorization.

6989867867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 438939648, while the sum is 74.

The square root of 6989867867 is about 83605.4296502326. The cubic root of 6989867867 is about 1912.0077812389.

The spelling of 6989867867 in words is "six billion, nine hundred eighty-nine million, eight hundred sixty-seven thousand, eight hundred sixty-seven".