66580555508566 has 32 divisors (see below), whose sum is σ = 113687644628736. Its totient is φ = 28947892380000.

The previous prime is 66580555508563. The next prime is 66580555508573.

66580555508566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66580555508495 and 66580555508504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66580555508563) 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, 118052341 + ... + 118614991.

It is an arithmetic number, because the mean of its divisors is an integer number (3552738894648).

Almost surely, 2^{66580555508566} is an apocalyptic number.

66580555508566 is a deficient number, since it is larger than the sum of its proper divisors (47107089120170).

66580555508566 is a wasteful number, since it uses less digits than its factorization.

66580555508566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796548.

The product of its (nonzero) digits is 1296000000, while the sum is 70.

The spelling of 66580555508566 in words is "sixty-six trillion, five hundred eighty billion, five hundred fifty-five million, five hundred eight thousand, five hundred sixty-six".