66475250689 has 8 divisors (see below), whose sum is σ = 69560029800. Its totient is φ = 63458269056.

The previous prime is 66475250687. The next prime is 66475250701. The reversal of 66475250689 is 98605257466.

It can be written as a sum of positive squares in 4 ways, for example, as 41836611600 + 24638639089 = 204540^2 + 156967^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66475250689 - 2¹ = 66475250687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66475250687) 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 7 ways as a sum of consecutive naturals, for example, 16947364 + ... + 16951285.

It is an arithmetic number, because the mean of its divisors is an integer number (8695003725).

Almost surely, 2^66475250689 is an apocalyptic number.

It is an amenable number.

66475250689 is a deficient number, since it is larger than the sum of its proper divisors (3084779111).

66475250689 is a wasteful number, since it uses less digits than its factorization.

66475250689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33898739.

The product of its (nonzero) digits is 21772800, while the sum is 58.

The spelling of 66475250689 in words is "sixty-six billion, four hundred seventy-five million, two hundred fifty thousand, six hundred eighty-nine".