66945128112 has 120 divisors (see below), whose sum is σ = 195640380000. Its totient is φ = 21329409024.

The previous prime is 66945128059. The next prime is 66945128141. The reversal of 66945128112 is 21182154966.

66945128112 is a `hidden beast` number, since 6 + 69 + 451 + 28 + 112 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5123764 + ... + 5136812.

It is an arithmetic number, because the mean of its divisors is an integer number (1630336500).

Almost surely, 2^66945128112 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 66945128112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97820190000).

66945128112 is an abundant number, since it is smaller than the sum of its proper divisors (128695251888).

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

66945128112 is a wasteful number, since it uses less digits than its factorization.

66945128112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14635 (or 14626 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 66945128112 in words is "sixty-six billion, nine hundred forty-five million, one hundred twenty-eight thousand, one hundred twelve".