6778308875545 has 4 divisors (see below), whose sum is σ = 8133970650660. Its totient is φ = 5422647100432.

The previous prime is 6778308875497. The next prime is 6778308875573. The reversal of 6778308875545 is 5455788038776.

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 3323212329024 + 3455096546521 = 1822968^2 + 1858789^2 .

It is a cyclic number.

It is not a de Polignac number, because 6778308875545 - 2¹⁵ = 6778308842777 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 677830887550 + ... + 677830887559.

It is an arithmetic number, because the mean of its divisors is an integer number (2033492662665).

Almost surely, 2^{6778308875545} is an apocalyptic number.

It is an amenable number.

6778308875545 is a deficient number, since it is larger than the sum of its proper divisors (1355661775115).

6778308875545 is a wasteful number, since it uses less digits than its factorization.

6778308875545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355661775114.

The product of its (nonzero) digits is 1580544000, while the sum is 73.

The spelling of 6778308875545 in words is "six trillion, seven hundred seventy-eight billion, three hundred eight million, eight hundred seventy-five thousand, five hundred forty-five".