66709408350 has 192 divisors, whose sum is σ = 180113472000. Its totient is φ = 16242301440.

The previous prime is 66709408349. The next prime is 66709408393. The reversal of 66709408350 is 5380490766.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66709408350.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 127551189 + ... + 127551711.

It is an arithmetic number, because the mean of its divisors is an integer number (938091000).

Almost surely, 2^66709408350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66709408350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90056736000).

66709408350 is an abundant number, since it is smaller than the sum of its proper divisors (113404063650).

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

66709408350 is a wasteful number, since it uses less digits than its factorization.

66709408350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1134 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 66709408350 in words is "sixty-six billion, seven hundred nine million, four hundred eight thousand, three hundred fifty".