6659640000 has 420 divisors, whose sum is σ = 25706096416. Its totient is φ = 1638144000.

The previous prime is 6659639989. The next prime is 6659640059. The reversal of 6659640000 is 469566.

It is a happy number.

6659640000 is a `hidden beast` number, since 6 + 6 + 5 + 9 + 640 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 4679289 + ... + 4680711.

Almost surely, 2^6659640000 is an apocalyptic number.

6659640000 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 6659640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12853048208).

6659640000 is an abundant number, since it is smaller than the sum of its proper divisors (19046456416).

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

6659640000 is a wasteful number, since it uses less digits than its factorization.

6659640000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 1446 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 6659640000 is about 81606.6173787396. The cubic root of 6659640000 is about 1881.4105906625.

The spelling of 6659640000 in words is "six billion, six hundred fifty-nine million, six hundred forty thousand".