6887885779 has 2 divisors, whose sum is σ = 6887885780. Its totient is φ = 6887885778.

The previous prime is 6887885747. The next prime is 6887885783. The reversal of 6887885779 is 9775887886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6887885779 - 2⁵ = 6887885747 is a prime.

It is not a weakly prime, because it can be changed into another prime (6887825779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3443942889 + 3443942890.

It is an arithmetic number, because the mean of its divisors is an integer number (3443942890).

Almost surely, 2^6887885779 is an apocalyptic number.

6887885779 is a deficient number, since it is larger than the sum of its proper divisors (1).

6887885779 is an equidigital number, since it uses as much as digits as its factorization.

6887885779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 379330560, while the sum is 73.

The square root of 6887885779 is about 82993.2875538739. The cubic root of 6887885779 is about 1902.6634648245.

The spelling of 6887885779 in words is "six billion, eight hundred eighty-seven million, eight hundred eighty-five thousand, seven hundred seventy-nine".