66248299728 has 120 divisors (see below), whose sum is σ = 201604096512. Its totient is φ = 20186129664.

The previous prime is 66248299709. The next prime is 66248299729. The reversal of 66248299728 is 82799284266.

66248299728 is a `hidden beast` number, since 6 + 62 + 482 + 9 + 97 + 2 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66248299729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21025 + ... + 364607.

Almost surely, 2^66248299728 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 66248299728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100802048256).

66248299728 is an abundant number, since it is smaller than the sum of its proper divisors (135355796784).

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

66248299728 is a wasteful number, since it uses less digits than its factorization.

66248299728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343713 (or 343704 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The spelling of 66248299728 in words is "sixty-six billion, two hundred forty-eight million, two hundred ninety-nine thousand, seven hundred twenty-eight".