66559895566 has 8 divisors (see below), whose sum is σ = 99856895544. Its totient is φ = 33274263720.

The previous prime is 66559895561. The next prime is 66559895587.

66559895566 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 66559895495 and 66559895504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66559895561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2827380 + ... + 2850823.

It is an arithmetic number, because the mean of its divisors is an integer number (12482111943).

Almost surely, 2^66559895566 is an apocalyptic number.

66559895566 is a deficient number, since it is larger than the sum of its proper divisors (33296999978).

66559895566 is a wasteful number, since it uses less digits than its factorization.

66559895566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5684066.

The product of its digits is 524880000, while the sum is 70.

The spelling of 66559895566 in words is "sixty-six billion, five hundred fifty-nine million, eight hundred ninety-five thousand, five hundred sixty-six".