6777966861 has 12 divisors (see below), whose sum is σ = 10366302492. Its totient is φ = 4252841856.

The previous prime is 6777966857. The next prime is 6777966887. The reversal of 6777966861 is 1686697776.

It can be written as a sum of positive squares in 2 ways, for example, as 4267355625 + 2510611236 = 65325^2 + 50106^2 .

It is not a de Polignac number, because 6777966861 - 2² = 6777966857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6777965861) 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 in 11 ways as a sum of consecutive naturals, for example, 22150066 + ... + 22150371.

It is an arithmetic number, because the mean of its divisors is an integer number (863858541).

Almost surely, 2^6777966861 is an apocalyptic number.

It is an amenable number.

6777966861 is a deficient number, since it is larger than the sum of its proper divisors (3588335631).

6777966861 is a wasteful number, since it uses less digits than its factorization.

6777966861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44300460 (or 44300457 counting only the distinct ones).

The product of its digits is 32006016, while the sum is 63.

The square root of 6777966861 is about 82328.4085902309. The cubic root of 6777966861 is about 1892.4880551985.

The spelling of 6777966861 in words is "six billion, seven hundred seventy-seven million, nine hundred sixty-six thousand, eight hundred sixty-one".