6778944562289 has 4 divisors (see below), whose sum is σ = 6778993008756. Its totient is φ = 6778896115824.

The previous prime is 6778944562267. The next prime is 6778944562301. The reversal of 6778944562289 is 9822654498776.

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 132035576689 + 6646908985600 = 363367^2 + 2578160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6778944562289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6778944562219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24012734 + ... + 24293399.

It is an arithmetic number, because the mean of its divisors is an integer number (1694748252189).

Almost surely, 2^{6778944562289} is an apocalyptic number.

It is an amenable number.

6778944562289 is a deficient number, since it is larger than the sum of its proper divisors (48446467).

6778944562289 is a wasteful number, since it uses less digits than its factorization.

6778944562289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48446466.

The product of its digits is 2926264320, while the sum is 77.

The spelling of 6778944562289 in words is "six trillion, seven hundred seventy-eight billion, nine hundred forty-four million, five hundred sixty-two thousand, two hundred eighty-nine".