66120384120 has 256 divisors, whose sum is σ = 240868131840. Its totient is φ = 14174773248.

The previous prime is 66120384119. The next prime is 66120384157. The reversal of 66120384120 is 2148302166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4176139 + ... + 4191941.

It is an arithmetic number, because the mean of its divisors is an integer number (940891140).

Almost surely, 2^66120384120 is an apocalyptic number.

66120384120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66120384120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120434065920).

66120384120 is an abundant number, since it is smaller than the sum of its proper divisors (174747747720).

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

66120384120 is a wasteful number, since it uses less digits than its factorization.

66120384120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16134 (or 16130 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

Adding to 66120384120 its reverse (2148302166), we get a palindrome (68268686286).

The spelling of 66120384120 in words is "sixty-six billion, one hundred twenty million, three hundred eighty-four thousand, one hundred twenty".