6891797787840 has 1792 divisors, whose sum is σ = 30817942732800. Its totient is φ = 1413552881664.

The previous prime is 6891797787839. The next prime is 6891797787851. The reversal of 6891797787840 is 487877971986.

It is a self number, because there is not a number n which added to its sum of digits gives 6891797787840.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 2827983102 + ... + 2827985538.

Almost surely, 2^{6891797787840} is an apocalyptic number.

6891797787840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6891797787840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15408971366400).

6891797787840 is an abundant number, since it is smaller than the sum of its proper divisors (23926144944960).

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

6891797787840 is a wasteful number, since it uses less digits than its factorization.

6891797787840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619 (or 2603 counting only the distinct ones).

The product of its (nonzero) digits is 2389782528, while the sum is 81.

The spelling of 6891797787840 in words is "six trillion, eight hundred ninety-one billion, seven hundred ninety-seven million, seven hundred eighty-seven thousand, eight hundred forty".