66261832722 has 162 divisors, whose sum is σ = 158042270997. Its totient is φ = 20059949952.

The previous prime is 66261832711. The next prime is 66261832723. The reversal of 66261832722 is 22723816266.

66261832722 is a `hidden beast` number, since 6 + 6 + 2 + 618 + 3 + 2 + 7 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 60644480121 + 5617352601 = 246261^2 + 74949^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=182019.

It is not an unprimeable number, because it can be changed into a prime (66261832723) by changing a digit.

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 80 ways as a sum of consecutive naturals, for example, 798335293 + ... + 798335375.

Almost surely, 2^66261832722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66261832722

66261832722 is an abundant number, since it is smaller than the sum of its proper divisors (91780438275).

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

66261832722 is a wasteful number, since it uses less digits than its factorization.

66261832722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 148 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The spelling of 66261832722 in words is "sixty-six billion, two hundred sixty-one million, eight hundred thirty-two thousand, seven hundred twenty-two".