6681866240 has 208 divisors, whose sum is σ = 18519785472. Its totient is φ = 2266693632.

The previous prime is 6681866239. The next prime is 6681866273. The reversal of 6681866240 is 426681866.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18206537 + ... + 18206903.

Almost surely, 2^6681866240 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 6681866240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9259892736).

6681866240 is an abundant number, since it is smaller than the sum of its proper divisors (11837919232).

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

6681866240 is a wasteful number, since it uses less digits than its factorization.

6681866240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 6681866240 is about 81742.6830976327. The cubic root of 6681866240 is about 1883.5013067261.

The spelling of 6681866240 in words is "six billion, six hundred eighty-one million, eight hundred sixty-six thousand, two hundred forty".