6778558776 has 32 divisors (see below), whose sum is σ = 18486979200. Its totient is φ = 2054108640.

The previous prime is 6778558751. The next prime is 6778558783.

It is a happy number.

6778558776 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12837916 + ... + 12838443.

It is an arithmetic number, because the mean of its divisors is an integer number (577718100).

Almost surely, 2^6778558776 is an apocalyptic number.

6778558776 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6778558776 is an abundant number, since it is smaller than the sum of its proper divisors (11708420424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6778558776 is a wasteful number, since it uses less digits than its factorization.

6778558776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25676379 (or 25676375 counting only the distinct ones).

The product of its digits is 138297600, while the sum is 66.

The square root of 6778558776 is about 82332.0033522809. The cubic root of 6778558776 is about 1892.5431434712.

It can be divided in two parts, 677 and 8558776, that added together give a triangular number (8559453 = T₄₁₃₇).

The spelling of 6778558776 in words is "six billion, seven hundred seventy-eight million, five hundred fifty-eight thousand, seven hundred seventy-six".