66631854080 has 144 divisors (see below), whose sum is σ = 175736286180. Its totient is φ = 24229314560.

The previous prime is 66631854061. The next prime is 66631854083. The reversal of 66631854080 is 8045813666.

It can be written as a sum of positive squares in 2 ways, for example, as 57124824064 + 9507030016 = 239008^2 + 97504^2 .

It is not an unprimeable number, because it can be changed into a prime (66631854083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1212152 + ... + 1265928.

Almost surely, 2^66631854080 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 66631854080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87868143090).

66631854080 is an abundant number, since it is smaller than the sum of its proper divisors (109104432100).

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

66631854080 is a wasteful number, since it uses less digits than its factorization.

66631854080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53826 (or 53795 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 66631854080 in words is "sixty-six billion, six hundred thirty-one million, eight hundred fifty-four thousand, eighty".