66567572660 has 24 divisors (see below), whose sum is σ = 144612314280. Its totient is φ = 25708855424.

The previous prime is 66567572609. The next prime is 66567572671. The reversal of 66567572660 is 6627576566.

It can be written as a sum of positive squares in 4 ways, for example, as 16145768356 + 50421804304 = 127066^2 + 224548^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66567572596 and 66567572605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57385259 + ... + 57386418.

It is an arithmetic number, because the mean of its divisors is an integer number (6025513095).

Almost surely, 2^66567572660 is an apocalyptic number.

It is an amenable number.

66567572660 is an abundant number, since it is smaller than the sum of its proper divisors (78044741620).

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

66567572660 is a wasteful number, since it uses less digits than its factorization.

66567572660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114771715 (or 114771713 counting only the distinct ones).

The product of its (nonzero) digits is 19051200, while the sum is 56.

The spelling of 66567572660 in words is "sixty-six billion, five hundred sixty-seven million, five hundred seventy-two thousand, six hundred sixty".