6681969840 has 320 divisors, whose sum is σ = 25664357376. Its totient is φ = 1400426496.

The previous prime is 6681969787. The next prime is 6681969851. The reversal of 6681969840 is 489691866.

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, 3558982 + ... + 3560858.

Almost surely, 2^6681969840 is an apocalyptic number.

6681969840 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 6681969840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12832178688).

6681969840 is an abundant number, since it is smaller than the sum of its proper divisors (18982387536).

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

6681969840 is a wasteful number, since it uses less digits than its factorization.

6681969840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2076 (or 2070 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 57.

The square root of 6681969840 is about 81743.3167910380. The cubic root of 6681969840 is about 1883.5110410188.

The spelling of 6681969840 in words is "six billion, six hundred eighty-one million, nine hundred sixty-nine thousand, eight hundred forty".