66584243880 has 960 divisors, whose sum is σ = 283147488000. Its totient is φ = 13450429440.

The previous prime is 66584243879. The next prime is 66584243899. The reversal of 66584243880 is 8834248566.

66584243880 is a `hidden beast` number, since 6 + 6 + 584 + 24 + 38 + 8 + 0 = 666.

It is an unprimeable number.

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, 446874046 + ... + 446874194.

It is an arithmetic number, because the mean of its divisors is an integer number (294945300).

Almost surely, 2^66584243880 is an apocalyptic number.

66584243880 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 66584243880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141573744000).

66584243880 is an abundant number, since it is smaller than the sum of its proper divisors (216563244120).

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

66584243880 is a wasteful number, since it uses less digits than its factorization.

66584243880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 54.

The spelling of 66584243880 in words is "sixty-six billion, five hundred eighty-four million, two hundred forty-three thousand, eight hundred eighty".