66418444288 has 96 divisors (see below), whose sum is σ = 154044072000. Its totient is φ = 28039790592.

The previous prime is 66418444273. The next prime is 66418444357. The reversal of 66418444288 is 88244481466.

It is a super-2 number, since 2×66418444288² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925938 + ... + 995086.

It is an arithmetic number, because the mean of its divisors is an integer number (1604625750).

Almost surely, 2^66418444288 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 66418444288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77022036000).

66418444288 is an abundant number, since it is smaller than the sum of its proper divisors (87625627712).

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

66418444288 is an equidigital number, since it uses as much as digits as its factorization.

66418444288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69245 (or 69225 counting only the distinct ones).

The product of its digits is 9437184, while the sum is 55.

The spelling of 66418444288 in words is "sixty-six billion, four hundred eighteen million, four hundred forty-four thousand, two hundred eighty-eight".