6664608720 has 1200 divisors, whose sum is σ = 31280819328. Its totient is φ = 1276508160.

The previous prime is 6664608707. The next prime is 6664608721. The reversal of 6664608720 is 278064666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664608721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 180124542 + ... + 180124578.

Almost surely, 2^6664608720 is an apocalyptic number.

6664608720 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 6664608720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15640409664).

6664608720 is an abundant number, since it is smaller than the sum of its proper divisors (24616210608).

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

6664608720 is a wasteful number, since it uses less digits than its factorization.

6664608720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 6664608720 is about 81637.0548219373. The cubic root of 6664608720 is about 1881.8783776356.

The spelling of 6664608720 in words is "six billion, six hundred sixty-four million, six hundred eight thousand, seven hundred twenty".