6659399680 has 224 divisors, whose sum is σ = 17300448000. Its totient is φ = 2452488192.

The previous prime is 6659399671. The next prime is 6659399689. The reversal of 6659399680 is 869939566.

It is an interprime number because it is at equal distance from previous prime (6659399671) and next prime (6659399689).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6659399689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33464221 + ... + 33464419.

Almost surely, 2^6659399680 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 6659399680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8650224000).

6659399680 is an abundant number, since it is smaller than the sum of its proper divisors (10641048320).

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

6659399680 is a wasteful number, since it uses less digits than its factorization.

6659399680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 18895680, while the sum is 61.

The square root of 6659399680 is about 81605.1449358434. The cubic root of 6659399680 is about 1881.3879595077.

The spelling of 6659399680 in words is "six billion, six hundred fifty-nine million, three hundred ninety-nine thousand, six hundred eighty".