660518815066 has 16 divisors (see below), whose sum is σ = 1090950366240. Its totient is φ = 297429881680.

The previous prime is 660518815049. The next prime is 660518815069.

660518815066 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (660518815069) 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, 140294761 + ... + 140299468.

It is an arithmetic number, because the mean of its divisors is an integer number (68184397890).

Almost surely, 2^660518815066 is an apocalyptic number.

660518815066 is a deficient number, since it is larger than the sum of its proper divisors (430431551174).

660518815066 is a wasteful number, since it uses less digits than its factorization.

660518815066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280594349.

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 660518815066 in words is "six hundred sixty billion, five hundred eighteen million, eight hundred fifteen thousand, sixty-six".