66750613120 has 128 divisors (see below), whose sum is σ = 168919344000. Its totient is φ = 25179721728.

The previous prime is 66750613081. The next prime is 66750613141. The reversal of 66750613120 is 2131605766.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×66750613120² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66750613120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 756261 + ... + 839899.

It is an arithmetic number, because the mean of its divisors is an integer number (1319682375).

Almost surely, 2^66750613120 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 66750613120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84459672000).

66750613120 is an abundant number, since it is smaller than the sum of its proper divisors (102168730880).

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

66750613120 is a wasteful number, since it uses less digits than its factorization.

66750613120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83730 (or 83718 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 66750613120 in words is "sixty-six billion, seven hundred fifty million, six hundred thirteen thousand, one hundred twenty".