6779107891 has 4 divisors (see below), whose sum is σ = 6802245072. Its totient is φ = 6755970712.

The previous prime is 6779107877. The next prime is 6779107919. The reversal of 6779107891 is 1987019776.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6779107891 is a prime.

It is a super-3 number, since 3×6779107891³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6779107091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11568151 + ... + 11568736.

It is an arithmetic number, because the mean of its divisors is an integer number (1700561268).

Almost surely, 2^6779107891 is an apocalyptic number.

6779107891 is a deficient number, since it is larger than the sum of its proper divisors (23137181).

6779107891 is a wasteful number, since it uses less digits than its factorization.

6779107891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23137180.

The product of its (nonzero) digits is 1333584, while the sum is 55.

The square root of 6779107891 is about 82335.3380450946. The cubic root of 6779107891 is about 1892.5942455714.

The spelling of 6779107891 in words is "six billion, seven hundred seventy-nine million, one hundred seven thousand, eight hundred ninety-one".