66850134912 has 384 divisors, whose sum is σ = 216530496000. Its totient is φ = 19622584320.

The previous prime is 66850134887. The next prime is 66850134913. The reversal of 66850134912 is 21943105866.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66850134913) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63726964 + ... + 63728012.

It is an arithmetic number, because the mean of its divisors is an integer number (563881500).

Almost surely, 2^66850134912 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 66850134912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108265248000).

66850134912 is an abundant number, since it is smaller than the sum of its proper divisors (149680361088).

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

66850134912 is a wasteful number, since it uses less digits than its factorization.

66850134912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 66850134912 in words is "sixty-six billion, eight hundred fifty million, one hundred thirty-four thousand, nine hundred twelve".