665517323715566 has 16 divisors (see below), whose sum is σ = 1165161028755456. Its totient is φ = 279153163138776.

The previous prime is 665517323715533. The next prime is 665517323715641.

665517323715566 is nontrivially palindromic in base 10.

665517323715566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 665517323715496 and 665517323715505.

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, 505712251406 + ... + 505712252721.

It is an arithmetic number, because the mean of its divisors is an integer number (72822564297216).

Almost surely, 2^{665517323715566} is an apocalyptic number.

665517323715566 is a deficient number, since it is larger than the sum of its proper divisors (499643705039890).

665517323715566 is a wasteful number, since it uses less digits than its factorization.

665517323715566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011424504183.

The product of its digits is 714420000, while the sum is 68.

The spelling of 665517323715566 in words is "six hundred sixty-five trillion, five hundred seventeen billion, three hundred twenty-three million, seven hundred fifteen thousand, five hundred sixty-six".