6789779881 has 2 divisors, whose sum is σ = 6789779882. Its totient is φ = 6789779880.

The previous prime is 6789779861. The next prime is 6789779897. The reversal of 6789779881 is 1889779876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6789760000 + 19881 = 82400^2 + 141^2 .

It is a cyclic number.

It is not a de Polignac number, because 6789779881 - 2⁹ = 6789779369 is a prime.

It is a super-2 number, since 2×6789779881² = 92202221664864748322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6789779881.

It is not a weakly prime, because it can be changed into another prime (6789779861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3394889940 + 3394889941.

It is an arithmetic number, because the mean of its divisors is an integer number (3394889941).

Almost surely, 2^6789779881 is an apocalyptic number.

It is an amenable number.

6789779881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6789779881 is an equidigital number, since it uses as much as digits as its factorization.

6789779881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 85349376, while the sum is 70.

The square root of 6789779881 is about 82400.1206370476. The cubic root of 6789779881 is about 1893.5868617926.

The spelling of 6789779881 in words is "six billion, seven hundred eighty-nine million, seven hundred seventy-nine thousand, eight hundred eighty-one".