6775049555821 has 16 divisors (see below), whose sum is σ = 7307420799600. Its totient is φ = 6258014945280.

The previous prime is 6775049555809. The next prime is 6775049555899. The reversal of 6775049555821 is 1285559405776.

It can be written as a sum of positive squares in 8 ways, for example, as 832127084100 + 5942922471721 = 912210^2 + 2437811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6775049555821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6775049555321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6809796 + ... + 7741021.

It is an arithmetic number, because the mean of its divisors is an integer number (456713799975).

Almost surely, 2^{6775049555821} is an apocalyptic number.

6775049555821 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6775049555821 is a deficient number, since it is larger than the sum of its proper divisors (532371243779).

6775049555821 is a wasteful number, since it uses less digits than its factorization.

6775049555821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14551344.

The product of its (nonzero) digits is 105840000, while the sum is 64.

The spelling of 6775049555821 in words is "six trillion, seven hundred seventy-five billion, forty-nine million, five hundred fifty-five thousand, eight hundred twenty-one".