66544333180 has 96 divisors (see below), whose sum is σ = 159467857920. Its totient is φ = 23107092480.

The previous prime is 66544333157. The next prime is 66544333181. The reversal of 66544333180 is 8133344566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66544333181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6576325 + ... + 6586435.

It is an arithmetic number, because the mean of its divisors is an integer number (1661123520).

Almost surely, 2^66544333180 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 66544333180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79733928960).

66544333180 is an abundant number, since it is smaller than the sum of its proper divisors (92923524740).

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

66544333180 is a wasteful number, since it uses less digits than its factorization.

66544333180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11639 (or 11637 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 43.

The spelling of 66544333180 in words is "sixty-six billion, five hundred forty-four million, three hundred thirty-three thousand, one hundred eighty".