66550005566 has 24 divisors (see below), whose sum is σ = 110152057680. Its totient is φ = 30132270080.

The previous prime is 66550005559. The next prime is 66550005589.

66550005566 is nontrivially palindromic in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472826 + ... + 597213.

It is an arithmetic number, because the mean of its divisors is an integer number (4589669070).

Almost surely, 2^66550005566 is an apocalyptic number.

66550005566 is a deficient number, since it is larger than the sum of its proper divisors (43602052114).

66550005566 is a wasteful number, since it uses less digits than its factorization.

66550005566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070320 (or 1070309 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 44.

The spelling of 66550005566 in words is "sixty-six billion, five hundred fifty million, five thousand, five hundred sixty-six".