6660445440 has 576 divisors, whose sum is σ = 25124520960. Its totient is φ = 1486356480.

The previous prime is 6660445439. The next prime is 6660445471. The reversal of 6660445440 is 445440666.

It is a congruent number.

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, 34509984 + ... + 34510176.

It is an arithmetic number, because the mean of its divisors is an integer number (43618960).

Almost surely, 2^6660445440 is an apocalyptic number.

6660445440 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 6660445440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12562260480).

6660445440 is an abundant number, since it is smaller than the sum of its proper divisors (18464075520).

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

6660445440 is a wasteful number, since it uses less digits than its factorization.

6660445440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The square root of 6660445440 is about 81611.5521234586. The cubic root of 6660445440 is about 1881.4864357162.

The spelling of 6660445440 in words is "six billion, six hundred sixty million, four hundred forty-five thousand, four hundred forty".