66554645566 has 16 divisors (see below), whose sum is σ = 104365083168. Its totient is φ = 31771634400.

The previous prime is 66554645503. The next prime is 66554645579.

66554645566 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 66554645566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1312305 + ... + 1362076.

It is an arithmetic number, because the mean of its divisors is an integer number (6522817698).

Almost surely, 2^66554645566 is an apocalyptic number.

66554645566 is a deficient number, since it is larger than the sum of its proper divisors (37810437602).

66554645566 is a wasteful number, since it uses less digits than its factorization.

66554645566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2674947.

The product of its digits is 77760000, while the sum is 58.

The spelling of 66554645566 in words is "sixty-six billion, five hundred fifty-four million, six hundred forty-five thousand, five hundred sixty-six".