6776616666613 has 4 divisors (see below), whose sum is σ = 6783306318828. Its totient is φ = 6769927014400.

The previous prime is 6776616666607. The next prime is 6776616666643. The reversal of 6776616666613 is 3166666166776.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 329450744484 + 6447165922129 = 573978^2 + 2539127^2 .

It is a cyclic number.

It is not a de Polignac number, because 6776616666613 - 2⁹ = 6776616666101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6776616666643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3344824588 + ... + 3344826613.

It is an arithmetic number, because the mean of its divisors is an integer number (1695826579707).

Almost surely, 2^{6776616666613} is an apocalyptic number.

It is an amenable number.

6776616666613 is a deficient number, since it is larger than the sum of its proper divisors (6689652215).

6776616666613 is a wasteful number, since it uses less digits than its factorization.

6776616666613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6689652214.

The product of its digits is 246903552, while the sum is 67.

The spelling of 6776616666613 in words is "six trillion, seven hundred seventy-six billion, six hundred sixteen million, six hundred sixty-six thousand, six hundred thirteen".