6678776778766 has 4 divisors (see below), whose sum is σ = 10018165168152. Its totient is φ = 3339388389382.

The previous prime is 6678776778761. The next prime is 6678776778799.

6678776778766 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6678776778761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1669694194690 + ... + 1669694194693.

It is an arithmetic number, because the mean of its divisors is an integer number (2504541292038).

Almost surely, 2^{6678776778766} is an apocalyptic number.

6678776778766 is a deficient number, since it is larger than the sum of its proper divisors (3339388389386).

6678776778766 is a wasteful number, since it uses less digits than its factorization.

6678776778766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3339388389385.

The product of its digits is 58549671936, while the sum is 88.

The spelling of 6678776778766 in words is "six trillion, six hundred seventy-eight billion, seven hundred seventy-six million, seven hundred seventy-eight thousand, seven hundred sixty-six".