6991571237112 has 384 divisors, whose sum is σ = 24849345715200. Its totient is φ = 1815988870080.

The previous prime is 6991571237099. The next prime is 6991571237137. The reversal of 6991571237112 is 2117321751996.

6991571237112 is a `hidden beast` number, since 69 + 9 + 1 + 571 + 2 + 3 + 7 + 1 + 1 + 2 = 666.

It is a super-2 number, since 2×6991571237112² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13839153 + ... + 14335455.

It is an arithmetic number, because the mean of its divisors is an integer number (64711837800).

Almost surely, 2^{6991571237112} 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 6991571237112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12424672857600).

6991571237112 is an abundant number, since it is smaller than the sum of its proper divisors (17857774478088).

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

6991571237112 is a wasteful number, since it uses less digits than its factorization.

6991571237112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496365 (or 496326 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 54.

The spelling of 6991571237112 in words is "six trillion, nine hundred ninety-one billion, five hundred seventy-one million, two hundred thirty-seven thousand, one hundred twelve".