6778820756171 has 4 divisors (see below), whose sum is σ = 6779197605600. Its totient is φ = 6778443906744.

The previous prime is 6778820756161. The next prime is 6778820756179. The reversal of 6778820756171 is 1716570288776.

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

It is a cyclic number.

It is not a de Polignac number, because 6778820756171 - 2⁶ = 6778820756107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6778820756098 and 6778820756107.

It is not an unprimeable number, because it can be changed into a prime (6778820756179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188397731 + ... + 188433708.

It is an arithmetic number, because the mean of its divisors is an integer number (1694799401400).

Almost surely, 2^{6778820756171} is an apocalyptic number.

6778820756171 is a deficient number, since it is larger than the sum of its proper divisors (376849429).

6778820756171 is a wasteful number, since it uses less digits than its factorization.

6778820756171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376849428.

The product of its (nonzero) digits is 55319040, while the sum is 65.

The spelling of 6778820756171 in words is "six trillion, seven hundred seventy-eight billion, eight hundred twenty million, seven hundred fifty-six thousand, one hundred seventy-one".