66566066566 has 32 divisors (see below), whose sum is σ = 102317445216. Its totient is φ = 32472000000.

The previous prime is 66566066563. The next prime is 66566066621.

It is a happy number.

66566066566 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66566066566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66566066563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6718216 + ... + 6728116.

It is an arithmetic number, because the mean of its divisors is an integer number (3197420163).

Almost surely, 2^66566066566 is an apocalyptic number.

66566066566 is a deficient number, since it is larger than the sum of its proper divisors (35751378650).

66566066566 is a wasteful number, since it uses less digits than its factorization.

66566066566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10488.

The product of its (nonzero) digits is 41990400, while the sum is 58.

The spelling of 66566066566 in words is "sixty-six billion, five hundred sixty-six million, sixty-six thousand, five hundred sixty-six".