6659725440 has 256 divisors, whose sum is σ = 22278758400. Its totient is φ = 1688924160.

The previous prime is 6659725439. The next prime is 6659725451. The reversal of 6659725440 is 445279566.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 6659725440.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10553925 + ... + 10554555.

It is an arithmetic number, because the mean of its divisors is an integer number (87026400).

Almost surely, 2^6659725440 is an apocalyptic number.

6659725440 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 6659725440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11139379200).

6659725440 is an abundant number, since it is smaller than the sum of its proper divisors (15619032960).

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

6659725440 is a wasteful number, since it uses less digits than its factorization.

6659725440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915 (or 903 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 48.

The square root of 6659725440 is about 81607.1408640200. The cubic root of 6659725440 is about 1881.4186364945.

The spelling of 6659725440 in words is "six billion, six hundred fifty-nine million, seven hundred twenty-five thousand, four hundred forty".