6853916820891 has 16 divisors (see below), whose sum is σ = 10898153455104. Its totient is φ = 3746240249664.

The previous prime is 6853916820869. The next prime is 6853916820911. The reversal of 6853916820891 is 1980286193586.

It is not a de Polignac number, because 6853916820891 - 2¹⁵ = 6853916788123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6853916820811) 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 15 ways as a sum of consecutive naturals, for example, 7095151506 + ... + 7095152471.

It is an arithmetic number, because the mean of its divisors is an integer number (681134590944).

Almost surely, 2^{6853916820891} is an apocalyptic number.

6853916820891 is a deficient number, since it is larger than the sum of its proper divisors (4044236634213).

6853916820891 is a wasteful number, since it uses less digits than its factorization.

6853916820891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14190304010.

The product of its (nonzero) digits is 44789760, while the sum is 66.

The spelling of 6853916820891 in words is "six trillion, eight hundred fifty-three billion, nine hundred sixteen million, eight hundred twenty thousand, eight hundred ninety-one".