6654881106891 has 20 divisors (see below), whose sum is σ = 10526021099352. Its totient is φ = 4175611674048.

The previous prime is 6654881106827. The next prime is 6654881106941. The reversal of 6654881106891 is 1986011884566.

6654881106891 is a `hidden beast` number, since 6 + 6 + 5 + 488 + 1 + 1 + 0 + 68 + 91 = 666.

It is not a de Polignac number, because 6654881106891 - 2⁶ = 6654881106827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6654881106191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2416440565 + ... + 2416443318.

Almost surely, 2^{6654881106891} is an apocalyptic number.

6654881106891 is a deficient number, since it is larger than the sum of its proper divisors (3871139992461).

6654881106891 is a wasteful number, since it uses less digits than its factorization.

6654881106891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832883912 (or 4832883903 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 63.

The spelling of 6654881106891 in words is "six trillion, six hundred fifty-four billion, eight hundred eighty-one million, one hundred six thousand, eight hundred ninety-one".