66851773296 has 960 divisors, whose sum is σ = 246224240640. Its totient is φ = 15386112000.

The previous prime is 66851773217. The next prime is 66851773349. The reversal of 66851773296 is 69237715866.

66851773296 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 624782875 + ... + 624782981.

It is an arithmetic number, because the mean of its divisors is an integer number (256483584).

Almost surely, 2^66851773296 is an apocalyptic number.

66851773296 is a gapful number since it is divisible by the number (66) 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 66851773296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123112120320).

66851773296 is an abundant number, since it is smaller than the sum of its proper divisors (179372467344).

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

66851773296 is a wasteful number, since it uses less digits than its factorization.

66851773296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 221 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 60.

The spelling of 66851773296 in words is "sixty-six billion, eight hundred fifty-one million, seven hundred seventy-three thousand, two hundred ninety-six".