6800818668561 has 12 divisors (see below), whose sum is σ = 9829027779792. Its totient is φ = 4531283864856.

The previous prime is 6800818668493. The next prime is 6800818668569. The reversal of 6800818668561 is 1658668180086.

6800818668561 is a `hidden beast` number, since 6 + 8 + 0 + 0 + 8 + 1 + 8 + 6 + 68 + 561 = 666.

It is not a de Polignac number, because 6800818668561 - 2¹⁰ = 6800818667537 is a prime.

It is a super-2 number, since 2×6800818668561² (a number of 26 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6800818668569) 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 11 ways as a sum of consecutive naturals, for example, 216254031 + ... + 216285476.

It is an arithmetic number, because the mean of its divisors is an integer number (819085648316).

Almost surely, 2^{6800818668561} is an apocalyptic number.

It is an amenable number.

6800818668561 is a deficient number, since it is larger than the sum of its proper divisors (3028209111231).

6800818668561 is a wasteful number, since it uses less digits than its factorization.

6800818668561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432541260 (or 432541257 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 63.

The spelling of 6800818668561 in words is "six trillion, eight hundred billion, eight hundred eighteen million, six hundred sixty-eight thousand, five hundred sixty-one".