66606650566 has 16 divisors (see below), whose sum is σ = 105554197440. Its totient is φ = 31470785920.

The previous prime is 66606650563. The next prime is 66606650651. The reversal of 66606650566 is 66505660666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66606650563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12214195 + ... + 12219646.

It is an arithmetic number, because the mean of its divisors is an integer number (6597137340).

Almost surely, 2^66606650566 is an apocalyptic number.

66606650566 is a deficient number, since it is larger than the sum of its proper divisors (38947546874).

66606650566 is a wasteful number, since it uses less digits than its factorization.

66606650566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24433919.

The product of its (nonzero) digits is 6998400, while the sum is 52.

The spelling of 66606650566 in words is "sixty-six billion, six hundred six million, six hundred fifty thousand, five hundred sixty-six".