6851510474844 has 96 divisors (see below), whose sum is σ = 19356521909760. Its totient is φ = 1841367693312.

The previous prime is 6851510474791. The next prime is 6851510474867. The reversal of 6851510474844 is 4484740151586.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1121512 + ... + 3867920.

It is an arithmetic number, because the mean of its divisors is an integer number (201630436560).

Almost surely, 2^{6851510474844} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6851510474844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9678260954880).

6851510474844 is an abundant number, since it is smaller than the sum of its proper divisors (12505011434916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6851510474844 is a wasteful number, since it uses less digits than its factorization.

6851510474844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748187 (or 2748185 counting only the distinct ones).

The product of its (nonzero) digits is 17203200, while the sum is 57.

The spelling of 6851510474844 in words is "six trillion, eight hundred fifty-one billion, five hundred ten million, four hundred seventy-four thousand, eight hundred forty-four".