6661680000 has 320 divisors, whose sum is σ = 22684551120. Its totient is φ = 1730560000.

The previous prime is 6661679963. The next prime is 6661680007. The reversal of 6661680000 is 861666.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661680007) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9839662 + ... + 9840338.

Almost surely, 2^6661680000 is an apocalyptic number.

6661680000 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 6661680000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11342275560).

6661680000 is an abundant number, since it is smaller than the sum of its proper divisors (16022871120).

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

6661680000 is an equidigital number, since it uses as much as digits as its factorization.

6661680000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 6661680000 is about 81619.1154080954. The cubic root of 6661680000 is about 1881.6026774107.

The spelling of 6661680000 in words is "six billion, six hundred sixty-one million, six hundred eighty thousand".