66804882440 has 64 divisors (see below), whose sum is σ = 154161999360. Its totient is φ = 26044012800.

The previous prime is 66804882409. The next prime is 66804882491. The reversal of 66804882440 is 4428840866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215777 + ... + 424463.

It is an arithmetic number, because the mean of its divisors is an integer number (2408781240).

Almost surely, 2^66804882440 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 66804882440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77080999680).

66804882440 is an abundant number, since it is smaller than the sum of its proper divisors (87357116920).

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

66804882440 is a wasteful number, since it uses less digits than its factorization.

66804882440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208902 (or 208898 counting only the distinct ones).

The product of its (nonzero) digits is 2359296, while the sum is 50.

The spelling of 66804882440 in words is "sixty-six billion, eight hundred four million, eight hundred eighty-two thousand, four hundred forty".