66625252666 has 24 divisors (see below), whose sum is σ = 116571099456. Its totient is φ = 28475861400.

The previous prime is 66625252663. The next prime is 66625252723.

66625252666 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×66625252666³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66625252663) 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 11 ways as a sum of consecutive naturals, for example, 890260 + ... + 962191.

It is an arithmetic number, because the mean of its divisors is an integer number (4857129144).

Almost surely, 2^66625252666 is an apocalyptic number.

66625252666 is a deficient number, since it is larger than the sum of its proper divisors (49945846790).

66625252666 is a wasteful number, since it uses less digits than its factorization.

66625252666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852834 (or 1852827 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 52.

The spelling of 66625252666 in words is "sixty-six billion, six hundred twenty-five million, two hundred fifty-two thousand, six hundred sixty-six".