6681085136 has 160 divisors (see below), whose sum is σ = 15490258560. Its totient is φ = 2757017600.

The previous prime is 6681085123. The next prime is 6681085189. The reversal of 6681085136 is 6315801866.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13125650 + ... + 13126158.

It is an arithmetic number, because the mean of its divisors is an integer number (96814116).

Almost surely, 2^6681085136 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 6681085136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7745129280).

6681085136 is an abundant number, since it is smaller than the sum of its proper divisors (8809173424).

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

6681085136 is a wasteful number, since it uses less digits than its factorization.

6681085136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 6681085136 is about 81737.9051358670. The cubic root of 6681085136 is about 1883.4279106775.

The spelling of 6681085136 in words is "six billion, six hundred eighty-one million, eighty-five thousand, one hundred thirty-six".