6776836661 has 6 divisors (see below), whose sum is σ = 7883259030. Its totient is φ = 5808717096.

The previous prime is 6776836637. The next prime is 6776836691. The reversal of 6776836661 is 1666386776.

It can be written as a sum of positive squares in only one way, i.e., 6527670436 + 249166225 = 80794^2 + 15785^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6776836661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6776836597 and 6776836606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6776836601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69151346 + ... + 69151443.

It is an arithmetic number, because the mean of its divisors is an integer number (1313876505).

Almost surely, 2^6776836661 is an apocalyptic number.

It is an amenable number.

6776836661 is a deficient number, since it is larger than the sum of its proper divisors (1106422369).

6776836661 is a wasteful number, since it uses less digits than its factorization.

6776836661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138302803 (or 138302796 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 56.

The square root of 6776836661 is about 82321.5443307522. The cubic root of 6776836661 is about 1892.3828609744.

The spelling of 6776836661 in words is "six billion, seven hundred seventy-six million, eight hundred thirty-six thousand, six hundred sixty-one".