66696317836825 has 24 divisors (see below), whose sum is σ = 82836445753152. Its totient is φ = 53271250662720.

The previous prime is 66696317836817. The next prime is 66696317836847. The reversal of 66696317836825 is 52863871369666.

66696317836825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66696317836825 - 2³ = 66696317836817 is a prime.

It is a Duffinian 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 23 ways as a sum of consecutive naturals, for example, 276585207 + ... + 276826243.

It is an arithmetic number, because the mean of its divisors is an integer number (3451518573048).

Almost surely, 2^{66696317836825} is an apocalyptic number.

It is an amenable number.

66696317836825 is a deficient number, since it is larger than the sum of its proper divisors (16140127916327).

66696317836825 is a wasteful number, since it uses less digits than its factorization.

66696317836825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258801 (or 258796 counting only the distinct ones).

The product of its digits is 2821754880, while the sum is 76.

The spelling of 66696317836825 in words is "sixty-six trillion, six hundred ninety-six billion, three hundred seventeen million, eight hundred thirty-six thousand, eight hundred twenty-five".