6686841870 has 128 divisors (see below), whose sum is σ = 18164551680. Its totient is φ = 1750066560.

The previous prime is 6686841869. The next prime is 6686841881. The reversal of 6686841870 is 781486866.

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 63 ways as a sum of consecutive naturals, for example, 6747075 + ... + 6748065.

It is an arithmetic number, because the mean of its divisors is an integer number (141910560).

Almost surely, 2^6686841870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6686841870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9082275840).

6686841870 is an abundant number, since it is smaller than the sum of its proper divisors (11477709810).

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

6686841870 is a wasteful number, since it uses less digits than its factorization.

6686841870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447 (or 1441 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The square root of 6686841870 is about 81773.1121457414. The cubic root of 6686841870 is about 1883.9687051072.

The spelling of 6686841870 in words is "six billion, six hundred eighty-six million, eight hundred forty-one thousand, eight hundred seventy".