6851991750912 has 720 divisors, whose sum is σ = 25547176271232. Its totient is φ = 1774550384640.

The previous prime is 6851991750859. The next prime is 6851991750931. The reversal of 6851991750912 is 2190571991586.

6851991750912 is a `hidden beast` number, since 68 + 51 + 9 + 9 + 1 + 7 + 509 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 6851991750912.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 563619138 + ... + 563631294.

Almost surely, 2^{6851991750912} 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 6851991750912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12773588135616).

6851991750912 is an abundant number, since it is smaller than the sum of its proper divisors (18695184520320).

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

6851991750912 is a wasteful number, since it uses less digits than its factorization.

6851991750912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12556 (or 12533 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 63.

The spelling of 6851991750912 in words is "six trillion, eight hundred fifty-one billion, nine hundred ninety-one million, seven hundred fifty thousand, nine hundred twelve".