66258761712 has 240 divisors, whose sum is σ = 213285098880. Its totient is φ = 17558069760.

The previous prime is 66258761711. The next prime is 66258761729. The reversal of 66258761712 is 21716785266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66258761711) 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, 1411483 + ... + 1457669.

It is an arithmetic number, because the mean of its divisors is an integer number (888687912).

Almost surely, 2^66258761712 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 66258761712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106642549440).

66258761712 is an abundant number, since it is smaller than the sum of its proper divisors (147026337168).

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

66258761712 is a wasteful number, since it uses less digits than its factorization.

66258761712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46252 (or 46235 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 51.

The spelling of 66258761712 in words is "sixty-six billion, two hundred fifty-eight million, seven hundred sixty-one thousand, seven hundred twelve".