66236133680 has 80 divisors (see below), whose sum is σ = 157442244480. Its totient is φ = 25903266816.

The previous prime is 66236133653. The next prime is 66236133721. The reversal of 66236133680 is 8633163266.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3739886 + ... + 3757554.

It is an arithmetic number, because the mean of its divisors is an integer number (1968028056).

Almost surely, 2^66236133680 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 66236133680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78721122240).

66236133680 is an abundant number, since it is smaller than the sum of its proper divisors (91206110800).

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

66236133680 is a wasteful number, since it uses less digits than its factorization.

66236133680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18726 (or 18720 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 66236133680 in words is "sixty-six billion, two hundred thirty-six million, one hundred thirty-three thousand, six hundred eighty".