66558285566 has 4 divisors (see below), whose sum is σ = 99837428352. Its totient is φ = 33279142782.

The previous prime is 66558285517. The next prime is 66558285587.

It is a happy number.

66558285566 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 66558285499 and 66558285508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16639571390 + ... + 16639571393.

It is an arithmetic number, because the mean of its divisors is an integer number (24959357088).

Almost surely, 2^66558285566 is an apocalyptic number.

66558285566 is a deficient number, since it is larger than the sum of its proper divisors (33279142786).

66558285566 is a wasteful number, since it uses less digits than its factorization.

66558285566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33279142785.

The product of its digits is 103680000, while the sum is 62.

The spelling of 66558285566 in words is "sixty-six billion, five hundred fifty-eight million, two hundred eighty-five thousand, five hundred sixty-six".